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Posted: 3/14/2015 8:10:57 PM EDT
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So today I went to shoot for the first time my new 11.5 inch BCM upper. The problem is that is jamming on every shot and before spending more money I prefer to ask first.
When I shoot it goes bang every time but when extracting, some things happens. 1: The BCG didn't pull the brass completely out of the chamber (most of it is out but the neck still inside) but the BCG tried to feed the next round leaving 2 cases on the upper 2: The brass is completely extracted but didn't got out of the upper and the BCG tried to feed the next round (most common) 3. The brass is completely extracted and the next round is about to enter the chamber but the empty brass got stuck on the ejection port 3 types of mags where tested and all did the same thing, so I dont think the mags are the problems. I was thinking on a heavier buffer maybe an H2 but nobody around here got one to let me tried it so I ask here first before buying. The ammo was 50 Fiocchi 55gr and 20 XM193 55gr What could be causing the problem? and how can I fix it? |
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I dont know if its does the same but the bolt came with a black plastic post inside the extractor spring. Quoted:
I dont know if its does the same but the bolt came with a black plastic post inside the extractor spring. You need one of these, or just the oring itself. It doesn't hurt to have the extra parts, though. http://www.bravocompanyusa.com/BCM-Extractor-Spring-Uprade-Kit-p/bcm%20extractor%20spring%20%203pack.htm Quoted:
Does the extractor have an O ring? My 11.5 would do the same thing without the O ring. 
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The bolt needs an oring put on the extractor spring. My 10.5" did the same thing until I put the oring in it. After several thousand rounds I've had 0 problems.. Seriously?? That's the shittiest system I've heard of. The o-ring was supposed to be a upgrade for military rifles to increase the reliability and service life the of the extractor spring + buffer piece. It should NOT be required to function. Send that POS back to BCM. All of them. |
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Like an above poster stated, "Is the BCG a BCM or something other brand"? BCM bolts come standard with a Monster extractor spring. The fact that the extractor is pulling the spent casing from the chamber points to it not being a spring tension problem. It could be under gassed. Fire the weapon with one round in the chamber and an empty mag locked in the mag well and see if the bolt carrier group locks to the rear, then go from there.
Use a flashlight and take a look at a clean chamber and see if there is any obvious scoring/scratches in the chamber. |
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I dont know if its does the same but the bolt came with a black plastic post inside the extractor spring. http://www.bravocompanyusa.com/BCM-Extractor-Spring-Uprade-Kit-p/bcm%20extractor%20spring%20%203pack.htm You need this. The upgraded spring should be all you need. If you have a BCM BCG... I am not sure what the problem is as them come standard with the upgraded spring. |
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How much lube do you have on it? A couple of my new uppers would jam when I first started building them. I only had a thin coat of oil on the BCG. After reading some threads on here, I pretty much dumped oil on it until it was dripping off. The jams stopped. I also do not put that much oil on them now and they still work great. No idea if this is your issue or not but I thought I would just throw it out there.
I always thought BCM test fired their uppers before shipping but I could be wrong on this. |
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Yes its a BCM upper with a BCM BCG
I took the offer of the free BCG included with the upper. I didn't change anything in the upper or BCG. I did that exactly only 1 round on the mag, loaded the rifle with that round. Fire and the round was extracted correctly, bolt hold open locked to the rear. There's no problem firing a single round. I did the several time while trying to zero the sights I checked the chamber and I could not see anything wrong with it and I checked the brass right now and it looks normal with no scratch marks. |
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Yes its a BCM upper with a BCM BCG I took the offer of the free BCG included with the upper. I didn't change anything in the upper or BCG. I did that exactly only 1 round on the mag, loaded the rifle with that round. Fire and the round was extracted correctly, bolt hold open locked to the rear. There's no problem firing a single round. I did the several time while trying to zero the sights I checked the chamber and I could not see anything wrong with it and I checked the brass right now and it looks normal with no scratch marks. Dang... BCM should have included the oring with e BCG. Install the oring and see if that helps. I would also contact BCM. |
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A BCM 11.5" with a BCM BCG should not be finicky, especially with decent ammo. I have the same setup, with a H2 buffer, works great. I recommend making sure you put a good amount of a good lube on the BCG, put a H2 buffer in it and try it. If that doesn't work, and I mean work perfectly, then you need to contact BCM's crew. They will take care of you. |
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How much lube do you have on it? A couple of my new uppers would jam when I first started building them. I only had a thin coat of oil on the BCG. After reading some threads on here, I pretty much dumped oil on it until it was dripping off. The jams stopped. I also do not put that much oil on them now and they still work great. No idea if this is your issue or not but I thought I would just throw it out there.
I always thought BCM test fired their uppers before shipping but I could be wrong on this. I lube this AR like I lube the other one. Slip 2000 on every contact or wear point. I dont know if this helps but this is a picture of the BCG I received with the rifle. Looks like the chrome lining got out of the bolt chamber (I dont remember how is called). This BCG is much more tight when new than the previous BCM BCG I bought for my other AR. 
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I'd make a bet that if you contacted BCM they would send you the oring for free.
ETA: I highly doubt it's under gassed, being a BCM upper. But I've seen crazier shit happen. So as already said, it could be. BCM may not have gotten the gas block on all the way, or it could have come loose and twisted a bit on the barrel. I'd definitely try the oring first, though. |
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You need one of these, or just the oring itself. It doesn't hurt to have the extra parts, though. http://www.bravocompanyusa.com/BCM-Extractor-Spring-Uprade-Kit-p/bcm%20extractor%20spring%20%203pack.htm
Quoted:
Quoted:
I dont know if its does the same but the bolt came with a black plastic post inside the extractor spring. You need one of these, or just the oring itself. It doesn't hurt to have the extra parts, though. http://www.bravocompanyusa.com/BCM-Extractor-Spring-Uprade-Kit-p/bcm%20extractor%20spring%20%203pack.htm Quoted:
Does the extractor have an O ring? My 11.5 would do the same thing without the O ring.
To be clear it only did it with cheap under powered steel case, brass wasn't an issue. |
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I'd make a bet that if you contacted BCM they would send you the oring for free. ETA: I highly doubt it's under gassed, being a BCM upper. But I've seen crazier shit happen. So as already said, it could be. BCM may not have gotten the gas block on all the way, or it could have come loose and twisted a bit on the barrel. I'd definitely try the oring first, though. BCM is somewhat innovative, but they've put out bad stuff before. I'll probably forever have a bad opinion of 14.5" midlengths, question automatically using heavier than standard buffers, and always question their products. Here's exactly how the process should have gone: Buy upper/gun. Fire it and it works perfectly, being optimally gassed or a little over gassed. No ordering any parts to make it function, etc. But lemons happen, from everyone, so in that case: Buy upper/gun and it has failures with multiple types of ammunition and magazines even after a good cleaning and lube, or is finicky with quality ammunition. Call the company and they fix it, free shipping both ways, etc. |
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BCM is somewhat innovative, but they've put out bad stuff before. I'll probably forever have a bad opinion of 14.5" midlengths, question automatically using heavier than standard buffers, and always question their products. Here's exactly how the process should have gone: Buy upper/gun. Fire it and it works perfectly, being optimally gassed or a little over gassed. No ordering any parts to make it function, etc. But lemons happen, from everyone, so in that case: Buy upper/gun and it has failures with multiple types of ammunition and magazines even after a good cleaning and lube, or is finicky with quality ammunition. Call the company and they fix it, free shipping both ways, etc. Quoted:
Quoted:
I'd make a bet that if you contacted BCM they would send you the oring for free. ETA: I highly doubt it's under gassed, being a BCM upper. But I've seen crazier shit happen. So as already said, it could be. BCM may not have gotten the gas block on all the way, or it could have come loose and twisted a bit on the barrel. I'd definitely try the oring first, though. BCM is somewhat innovative, but they've put out bad stuff before. I'll probably forever have a bad opinion of 14.5" midlengths, question automatically using heavier than standard buffers, and always question their products. Here's exactly how the process should have gone: Buy upper/gun. Fire it and it works perfectly, being optimally gassed or a little over gassed. No ordering any parts to make it function, etc. But lemons happen, from everyone, so in that case: Buy upper/gun and it has failures with multiple types of ammunition and magazines even after a good cleaning and lube, or is finicky with quality ammunition. Call the company and they fix it, free shipping both ways, etc. I have owned 5 BCM 14.5" mids to date. I have run them all from day one with an H2 buffer, and an enhanced powered Sprinco Blue spring...and also fed them all a primary diet of weaker PMC Bronze 223. Still waiting for one to have a single reliability issue...even one round. |
| You said it's the first time taking the rifle out. Nobody wants to admit it, but sometimes there's a break-in period for these things. Lube the HELL OUT OF IT, and keep firing. Add the O-ring for good measure, but in my experience BCM BCGs are very, very tight. A ton of lube will help it while it breaks in, and then it should work fine, |
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You said it's the first time taking the rifle out. Nobody wants to admit it, but sometimes there's a break-in period for these things. Lube the HELL OUT OF IT, and keep firing. Add the O-ring for good measure, but in my experience BCM BCGs are very, very tight. A ton of lube will help it while it breaks in, and then it should work fine, This is some sound advice here. I literally lube the living shit out of my new BCGs and uppers. I'm talking soaking wet inside. Never hurts with a brand new BCG/upper. |
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So today I went to shoot for the first time my new 11.5 inch BCM upper. The problem is that is jamming on every shot and before spending more money I prefer to ask first. When I shoot it goes bang every time but when extracting, some things happens. 1: The BCG didn't pull the brass completely out of the chamber (most of it is out but the neck still inside) but the BCG tried to feed the next round leaving 2 cases on the upper 2: The brass is completely extracted but didn't got out of the upper and the BCG tried to feed the next round (most common) 3. The brass is completely extracted and the next round is about to enter the chamber but the empty brass got stuck on the ejection port 3 types of mags where tested and all did the same thing, so I dont think the mags are the problems. I was thinking on a heavier buffer maybe an H2 but nobody around here got one to let me tried it so I ask here first before buying. The ammo was 50 Fiocchi 55gr and 20 XM193 55gr What could be causing the problem? and how can I fix it? SBRs NEED heavier buffers because of the larger gas ports. Your gun is trying to extract too soon while the casing is still under pressure causing cases to stick in chamber leading to failures to extract. You need to DELAY the bolt unlocking to allow for proper extraction. Get an H2 or an H3 if you are planning on running 5.56 pressure ammo. |
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You said it's the first time taking the rifle out. Nobody wants to admit it, but sometimes there's a break-in period for these things. Lube the HELL OUT OF IT, and keep firing. Add the O-ring for good measure, but in my experience BCM BCGs are very, very tight. A ton of lube will help it while it breaks in, and then it should work fine, Not to change the subject here, but would actually more lubrication help break in? As you want the parts to "wear" to each other for smooth operation. The more lubrication the longer this would take... in theory anyway. I could see where the greater amount of lubrication would help with stoppages during break in. |
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SBRs NEED heavier buffers because of the larger gas ports. Your gun is trying to extract too soon while the casing is still under pressure causing cases to stick in chamber leading to failures to extract. You need to DELAY the bolt unlocking to allow for proper extraction. Get an H2 or an H3 if you are planning on running 5.56 pressure ammo. Quoted:
Quoted:
So today I went to shoot for the first time my new 11.5 inch BCM upper. The problem is that is jamming on every shot and before spending more money I prefer to ask first. When I shoot it goes bang every time but when extracting, some things happens. 1: The BCG didn't pull the brass completely out of the chamber (most of it is out but the neck still inside) but the BCG tried to feed the next round leaving 2 cases on the upper 2: The brass is completely extracted but didn't got out of the upper and the BCG tried to feed the next round (most common) 3. The brass is completely extracted and the next round is about to enter the chamber but the empty brass got stuck on the ejection port 3 types of mags where tested and all did the same thing, so I dont think the mags are the problems. I was thinking on a heavier buffer maybe an H2 but nobody around here got one to let me tried it so I ask here first before buying. The ammo was 50 Fiocchi 55gr and 20 XM193 55gr What could be causing the problem? and how can I fix it? SBRs NEED heavier buffers because of the larger gas ports. Your gun is trying to extract too soon while the casing is still under pressure causing cases to stick in chamber leading to failures to extract. You need to DELAY the bolt unlocking to allow for proper extraction. Get an H2 or an H3 if you are planning on running 5.56 pressure ammo. I was about to say the same thing. Should be running an H2 at a minimum. Heavier if running suppressed. |
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SBRs NEED heavier buffers because of the larger gas ports. Your gun is trying to extract too soon while the casing is still under pressure causing cases to stick in chamber leading to failures to extract. You need to DELAY the bolt unlocking to allow for proper extraction. Get an H2 or an H3 if you are planning on running 5.56 pressure ammo. Quoted:
Quoted:
So today I went to shoot for the first time my new 11.5 inch BCM upper. The problem is that is jamming on every shot and before spending more money I prefer to ask first. When I shoot it goes bang every time but when extracting, some things happens. 1: The BCG didn't pull the brass completely out of the chamber (most of it is out but the neck still inside) but the BCG tried to feed the next round leaving 2 cases on the upper 2: The brass is completely extracted but didn't got out of the upper and the BCG tried to feed the next round (most common) 3. The brass is completely extracted and the next round is about to enter the chamber but the empty brass got stuck on the ejection port 3 types of mags where tested and all did the same thing, so I dont think the mags are the problems. I was thinking on a heavier buffer maybe an H2 but nobody around here got one to let me tried it so I ask here first before buying. The ammo was 50 Fiocchi 55gr and 20 XM193 55gr What could be causing the problem? and how can I fix it? SBRs NEED heavier buffers because of the larger gas ports. Your gun is trying to extract too soon while the casing is still under pressure causing cases to stick in chamber leading to failures to extract. You need to DELAY the bolt unlocking to allow for proper extraction. Get an H2 or an H3 if you are planning on running 5.56 pressure ammo. This is BS. I have a handful of SBR's ranging from 10.5" to 14.5", and NONE of them have anything more than the standard carbine buffer in them. They all run fine, and have from day one. Two of these SBR's are running JP LMOS BC's, and 1oz. carbine buffers. They run better than the standard hardware! |
| I run my 11.5 with FA BCG and standard carbine buffer. No o-ring on the extractor. 0 failures in 1000rds. I do have an adjustable gas block but the Spikes barrel I used was aproprietly gassed so I tuned it down just barely with the gas block. But I digress.... If it were my gun, I would try some better ammo first. Then run a couple hundred rds for break in. If that doesn't help then send the thing back to Bravo. With the reputation they have and the prices they charge, they should be taking care of you. Just my 2 cents... |
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Not to change the subject here, but would actually more lubrication help break in? As you want the parts to "wear" to each other for smooth operation. The more lubrication the longer this would take... in theory anyway. I could see where the greater amount of lubrication would help with stoppages during break in. Quoted:
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You said it's the first time taking the rifle out. Nobody wants to admit it, but sometimes there's a break-in period for these things. Lube the HELL OUT OF IT, and keep firing. Add the O-ring for good measure, but in my experience BCM BCGs are very, very tight. A ton of lube will help it while it breaks in, and then it should work fine, Not to change the subject here, but would actually more lubrication help break in? As you want the parts to "wear" to each other for smooth operation. The more lubrication the longer this would take... in theory anyway. I could see where the greater amount of lubrication would help with stoppages during break in. I thought about this too but I was on the side of more lube durring break-in so the parts can wear more smoothly. Kind of like using lube while machining things in theory. I have no experience with the 11.5 but the one thing I like about the BCM bcg is how great it ejects. I know some say the o-ring/upgrade spring is just a mask for bad headspace but if it makes things run better I am all for it. I would get the O-ring first and BCM should send you one if that fails change buffer weights and if that fails have them check the gas port I guess. Edit-What the above poster said is the best move BCM should take care of you also did the bolt have a O-ring already? |
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This is BS. I have a handful of SBR's ranging from 10.5" to 14.5", and NONE of them have anything more than the standard carbine buffer in them. They all run fine, and have from day one. Two of these SBR's are running JP LMOS BC's, and 1oz. carbine buffers. They run better than the standard hardware! Quoted:
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So today I went to shoot for the first time my new 11.5 inch BCM upper. The problem is that is jamming on every shot and before spending more money I prefer to ask first. When I shoot it goes bang every time but when extracting, some things happens. 1: The BCG didn't pull the brass completely out of the chamber (most of it is out but the neck still inside) but the BCG tried to feed the next round leaving 2 cases on the upper 2: The brass is completely extracted but didn't got out of the upper and the BCG tried to feed the next round (most common) 3. The brass is completely extracted and the next round is about to enter the chamber but the empty brass got stuck on the ejection port 3 types of mags where tested and all did the same thing, so I dont think the mags are the problems. I was thinking on a heavier buffer maybe an H2 but nobody around here got one to let me tried it so I ask here first before buying. The ammo was 50 Fiocchi 55gr and 20 XM193 55gr What could be causing the problem? and how can I fix it? SBRs NEED heavier buffers because of the larger gas ports. Your gun is trying to extract too soon while the casing is still under pressure causing cases to stick in chamber leading to failures to extract. You need to DELAY the bolt unlocking to allow for proper extraction. Get an H2 or an H3 if you are planning on running 5.56 pressure ammo. This is BS. I have a handful of SBR's ranging from 10.5" to 14.5", and NONE of them have anything more than the standard carbine buffer in them. They all run fine, and have from day one. Two of these SBR's are running JP LMOS BC's, and 1oz. carbine buffers. They run better than the standard hardware! I won't challenge your claims, but I'd be interested in knowing what loads you're running and what equipment you're using to achieve flawless results. |
Reading comprehension fail on my part, I thought the OP was having issues with steel case 
My 11.5 BCM upper ran fine from day one without an o-ring (the bcm bcg didn't come with one) with everything but weak steel case. After adding an o-ring the steel case ran flawlessly as well. I would contact BCM and see what they say. |
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I won't challenge your claims, but I'd be interested in knowing what loads you're running and what equipment you're using to achieve flawless results. Reloads, standard carbine buffer, standard carbine spring, and I run adjustable gas blocks on everything. I don't know why this is so hard to believe. ETA: I should add. I don't "buy" AR's, or already built uppers/lowers. The only AR I have ever actually bought was an RRA LEF-T for my left handed wife. |
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I send back my upper they "put my upper through our factory compliance evaluation and refit procedures. You have a new extractor and a clean chamber. Please be sure to properly maintain your rifle and above all else, enjoy! "
I shoot 300 rounds last sunday and ran flawlessly. Whatever it was is now fixed. meanwhile I try to make a XM177 clone |
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Reloads, standard carbine buffer, standard carbine spring, and I run adjustable gas blocks on everything. I don't know why this is so hard to believe. ETA: I should add. I don't "buy" AR's, or already built uppers/lowers. The only AR I have ever actually bought was an RRA LEF-T for my left handed wife. Quoted:
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I won't challenge your claims, but I'd be interested in knowing what loads you're running and what equipment you're using to achieve flawless results. Reloads, standard carbine buffer, standard carbine spring, and I run adjustable gas blocks on everything. I don't know why this is so hard to believe. ETA: I should add. I don't "buy" AR's, or already built uppers/lowers. The only AR I have ever actually bought was an RRA LEF-T for my left handed wife. It's not hard to believe. But you called BS and then went on to compare apples to oranges. The statement he made regarding delaying bolt unlocking for generously-gassed short barreled ARs shooting NATO 556 is accurate and the very problem the military had when they went to a carbine, the proper port size, heavier buffers and beefed up extraction was needed to solve this issue. |
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