AR Sponsor
Posted: 12/20/2013 3:32:34 PM EDT
|
I bought a brand new BCM 14.5" upper and put it on a Spike lower. Cleaned it off before firing, and in two
range sessions shot a total of 168 rounds without issue. Cleaning it this evening, I noticed when I pulled the bolt out of the carrier that one of the 3 gas rings on the bolt was chewed to hell, and was bent out and kind of hanging out. I replaced it with a spare ring. Question-is this a symptom of some problem with the bolt or the carrier (both new BCM) or does this just happen sometimes? |
| These 14.5" mid length gas barreled upper receiver groups have been specifically tuned to be a very soft and fast shooting set up. They are a joy to shoot, but please feed it good ammo. With good milspec pressured ammo we have been running H buffers. We do not recommend using lower powered ammo. If using less than milspec pressured ammo, it may be best to run a standard carbine buffer.http://goo.gl/Dy4Wo6 |
|
Quoted:
ryann, Do you oil your gas rings? I usually do when getting my rifle ready for shooting. That also includes two drops of oil on the gas post holes in the side of the BCG. Impala Quoted:
Quoted:
At least with the naked eye I cant see any burrs... ryann, Do you oil your gas rings? I usually do when getting my rifle ready for shooting. That also includes two drops of oil on the gas post holes in the side of the BCG. Impala No but I'll start... 
|
|
Quoted:
These 14.5" mid length gas barreled upper receiver groups have been specifically tuned to be a very soft and fast shooting set up. They are a joy to shoot, but please feed it good ammo. With good milspec pressured ammo we have been running H buffers. We do not recommend using lower powered ammo. If using less than milspec pressured ammo, it may be best to run a standard carbine buffer.http://goo.gl/Dy4Wo6 I have an H buffer-I have shot a lot of AE 223 bulk in addition to some LC M855 and XM193....so this isn't like a major malfunction with the gun, bolt or bcg? |
|
Quoted:
These 14.5" mid length gas barreled upper receiver groups have been specifically tuned to be a very soft and fast shooting set up. They are a joy to shoot, but please feed it good ammo. With good milspec pressured ammo we have been running H buffers. We do not recommend using lower powered ammo. If using less than milspec pressured ammo, it may be best to run a standard carbine buffer.http://goo.gl/Dy4Wo6 procarry, That's odd cuz my 14.5" AR was short cycleing using PMC Bronze. After using a different brand of ammo (PMC target) all was well. I wonder if I have a "H" buffer in mine? I'll look into this when I get some time.. Impala |
|
I just disassembled a new Spikes BCG for inspection. Other than a light film of protective oil there was no real lubricant anywhere on the bolt. I coated gas rings and all moving parts with Lubriplate 130-A from Brownells. Selected by the U.S. Military to lubricate M1 Garand and M14 battle rifles. A waterproof blend of mineral oil, calcium and zinc oxide that has a high affinity for metal so it stays put in all weather conditions, and lubricates even after the carrier begins to break down. Weapon cycles nice. |
|
Quoted: I just disassembled a new Spikes BCG for inspection. Other than a light film of protective oil there was no real lubricant anywhere on the bolt. I coated gas rings and all moving parts with Lubriplate 130-A from Brownells. Selected by the U.S. Military to lubricate M1 Garand and M14 battle rifles. A waterproof blend of mineral oil, calcium and zinc oxide that has a high affinity for metal so it stays put in all weather conditions, and lubricates even after the carrier begins to break down. Weapon cycles nice. That's why the US Military selected CLP, and CLP only, for the DI AR platform firearms. |
| Someone could have stretched out the ring when putting them on the bolt very easy to over do it and bend a ring...its good you had a spare to replace it.As far as lube I used to use CLP even LSA worked well now I use slip2000 EWL and they make a grease as well wich wont gum up an AR.Ive used the red wheel bearing grease on bolts and lugs and have shot them filthy nothings ever gummed up. |
|
Quoted:
If I have to send this back to Bravo would it involve sending the whole upper or just the BCG? Just the BCG needs to go back. ETA Check the carrier again.Remove the deformed gas ring and leave the two good rings in place.Slowly insert the bolt into the carrier easing it in place.Install the cam pin.Now slowly work the bolt in and out of the carrier to see if there are any hitches in the movement.Bolt should have somewhat of a gritty feel and slight resistance with new rings,but essentially smooth.If you feel any spots that seems to hang up,note the position of the bolt in the carrier and eye ball that approximate area in the carrier and examine the gas rings for a groove/scratch. If the bolt is difficult to insert,hangs up,entering the gas chamber(smaller rear bore) of the carrier there may be some machining artifact/ridge on the transitioning shoulder/ramp of the larger front chamber.The rear and middle gas ring has more support as they stack on insertion the front gas ring does not.So it will deform much easier than the others in this case. Also note that the gas rings are stamped sheet metal.As such will have a sharp rolled edge to one side.I try to make sure that sharp,rolled sharp edge on all rings is facing the same direction,towards the bolt tail.Nothing specific,just seems to allow the rings to mate with each other better and wear in more consistently. |
|
Quoted:
Just the BCG needs to go back. ETA Check the carrier again.Remove the deformed gas ring and leave the two good rings in place.Slowly insert the bolt into the carrier easing it in place.Install the cam pin.Now slowly work the bolt in and out of the carrier to see if there are any hitches in the movement.Bolt should have somewhat of a gritty feel and slight resistance with new rings,but essentially smooth.If you feel any spots that seems to hang up,note the position of the bolt in the carrier and eye ball that approximate area in the carrier and examine the gas rings for a groove/scratch. If the bolt is difficult to insert,hangs up,entering the gas chamber(smaller rear bore) of the carrier there may be some machining artifact/ridge on the transitioning shoulder/ramp of the larger front chamber.The rear and middle gas ring has more support as they stack on insertion the front gas ring does not.So it will deform much easier than the others in this case. Also note that the gas rings are stamped sheet metal.As such will have a sharp rolled edge to one side.I try to make sure that sharp,rolled sharp edge on all rings is facing the same direction,towards the bolt tail.Nothing specific,just seems to allow the rings to mate with each other better and wear in more consistently. Quoted:
Quoted:
If I have to send this back to Bravo would it involve sending the whole upper or just the BCG? Just the BCG needs to go back. ETA Check the carrier again.Remove the deformed gas ring and leave the two good rings in place.Slowly insert the bolt into the carrier easing it in place.Install the cam pin.Now slowly work the bolt in and out of the carrier to see if there are any hitches in the movement.Bolt should have somewhat of a gritty feel and slight resistance with new rings,but essentially smooth.If you feel any spots that seems to hang up,note the position of the bolt in the carrier and eye ball that approximate area in the carrier and examine the gas rings for a groove/scratch. If the bolt is difficult to insert,hangs up,entering the gas chamber(smaller rear bore) of the carrier there may be some machining artifact/ridge on the transitioning shoulder/ramp of the larger front chamber.The rear and middle gas ring has more support as they stack on insertion the front gas ring does not.So it will deform much easier than the others in this case. Also note that the gas rings are stamped sheet metal.As such will have a sharp rolled edge to one side.I try to make sure that sharp,rolled sharp edge on all rings is facing the same direction,towards the bolt tail.Nothing specific,just seems to allow the rings to mate with each other better and wear in more consistently. The rear (or top) deformed first, then the bottom. Thanks for the advice I'll try that. |
|
Quoted:
The rear (or top) deformed first, then the bottom. Thanks for the advice I'll try that. Quoted:
Quoted:
Quoted:
If I have to send this back to Bravo would it involve sending the whole upper or just the BCG? Just the BCG needs to go back. ETA Check the carrier again.Remove the deformed gas ring and leave the two good rings in place.Slowly insert the bolt into the carrier easing it in place.Install the cam pin.Now slowly work the bolt in and out of the carrier to see if there are any hitches in the movement.Bolt should have somewhat of a gritty feel and slight resistance with new rings,but essentially smooth.If you feel any spots that seems to hang up,note the position of the bolt in the carrier and eye ball that approximate area in the carrier and examine the gas rings for a groove/scratch. If the bolt is difficult to insert,hangs up,entering the gas chamber(smaller rear bore) of the carrier there may be some machining artifact/ridge on the transitioning shoulder/ramp of the larger front chamber.The rear and middle gas ring has more support as they stack on insertion the front gas ring does not.So it will deform much easier than the others in this case. Also note that the gas rings are stamped sheet metal.As such will have a sharp rolled edge to one side.I try to make sure that sharp,rolled sharp edge on all rings is facing the same direction,towards the bolt tail.Nothing specific,just seems to allow the rings to mate with each other better and wear in more consistently. The rear (or top) deformed first, then the bottom. Thanks for the advice I'll try that. I'd just email BCM the pics you have,get an RMA and let them deal with it. Ive had a few carriers that had similar issues to yours,the manufacturers replaced them without question.One of the many reasons I keep a spare,well tested(done personally) BCG in the parts cabinet.Helps prevent down time. |
|
Quoted:
This sound real good Quoted:
Quoted:
Check for burrs inside the carriers bore, in the rear where the gas rings ride. This sound real good A good friend with a better eye than mine noted that the inside of the carrier is rough, it doesn't seem to be machined quite right. I went to the industry forum to talk to bcm about this, as I cant access their web site email address |
|
Quoted:
I'd just email BCM the pics you have,get an RMA and let them deal with it. Ive had a few carriers that had similar issues to yours,the manufacturers replaced them without question.One of the many reasons I keep a spare,well tested(done personally) BCG in the parts cabinet.Helps prevent down time. Quoted:
Quoted:
Quoted:
Quoted:
If I have to send this back to Bravo would it involve sending the whole upper or just the BCG? Just the BCG needs to go back. ETA Check the carrier again.Remove the deformed gas ring and leave the two good rings in place.Slowly insert the bolt into the carrier easing it in place.Install the cam pin.Now slowly work the bolt in and out of the carrier to see if there are any hitches in the movement.Bolt should have somewhat of a gritty feel and slight resistance with new rings,but essentially smooth.If you feel any spots that seems to hang up,note the position of the bolt in the carrier and eye ball that approximate area in the carrier and examine the gas rings for a groove/scratch. If the bolt is difficult to insert,hangs up,entering the gas chamber(smaller rear bore) of the carrier there may be some machining artifact/ridge on the transitioning shoulder/ramp of the larger front chamber.The rear and middle gas ring has more support as they stack on insertion the front gas ring does not.So it will deform much easier than the others in this case. Also note that the gas rings are stamped sheet metal.As such will have a sharp rolled edge to one side.I try to make sure that sharp,rolled sharp edge on all rings is facing the same direction,towards the bolt tail.Nothing specific,just seems to allow the rings to mate with each other better and wear in more consistently. The rear (or top) deformed first, then the bottom. Thanks for the advice I'll try that. I'd just email BCM the pics you have,get an RMA and let them deal with it. Ive had a few carriers that had similar issues to yours,the manufacturers replaced them without question.One of the many reasons I keep a spare,well tested(done personally) BCG in the parts cabinet.Helps prevent down time. Should just the carrier be replaced and the bolt kept? |
|
Quoted:
These 14.5" mid length gas barreled upper receiver groups have been specifically tuned to be a very soft and fast shooting set up. They are a joy to shoot, but please feed it good ammo. With good milspec pressured ammo we have been running H buffers. We do not recommend using lower powered ammo. If using less than milspec pressured ammo, it may be best to run a standard carbine buffer.http://goo.gl/Dy4Wo6 I run an H3 Vltor A5 and Wolf ammo in several 14.5" and 16" mids with no issues. Don't spread bullshit. |
|
Quoted:
I run an H3 Vltor A5 and Wolf ammo in several 14.5" and 16" mids with no issues. Don't spread bullshit. Quoted:
Quoted:
These 14.5" mid length gas barreled upper receiver groups have been specifically tuned to be a very soft and fast shooting set up. They are a joy to shoot, but please feed it good ammo. With good milspec pressured ammo we have been running H buffers. We do not recommend using lower powered ammo. If using less than milspec pressured ammo, it may be best to run a standard carbine buffer.http://goo.gl/Dy4Wo6 I run an H3 Vltor A5 and Wolf ammo in several 14.5" and 16" mids with no issues. Don't spread bullshit. thank you this is probably a simple problem with a simple fix |
|
Quoted:
Should just the carrier be replaced and the bolt kept? Quoted:
Quoted:
Quoted:
Quoted:
Quoted:
If I have to send this back to Bravo would it involve sending the whole upper or just the BCG? Just the BCG needs to go back. ETA Check the carrier again.Remove the deformed gas ring and leave the two good rings in place.Slowly insert the bolt into the carrier easing it in place.Install the cam pin.Now slowly work the bolt in and out of the carrier to see if there are any hitches in the movement.Bolt should have somewhat of a gritty feel and slight resistance with new rings,but essentially smooth.If you feel any spots that seems to hang up,note the position of the bolt in the carrier and eye ball that approximate area in the carrier and examine the gas rings for a groove/scratch. If the bolt is difficult to insert,hangs up,entering the gas chamber(smaller rear bore) of the carrier there may be some machining artifact/ridge on the transitioning shoulder/ramp of the larger front chamber.The rear and middle gas ring has more support as they stack on insertion the front gas ring does not.So it will deform much easier than the others in this case. Also note that the gas rings are stamped sheet metal.As such will have a sharp rolled edge to one side.I try to make sure that sharp,rolled sharp edge on all rings is facing the same direction,towards the bolt tail.Nothing specific,just seems to allow the rings to mate with each other better and wear in more consistently. The rear (or top) deformed first, then the bottom. Thanks for the advice I'll try that. I'd just email BCM the pics you have,get an RMA and let them deal with it. Ive had a few carriers that had similar issues to yours,the manufacturers replaced them without question.One of the many reasons I keep a spare,well tested(done personally) BCG in the parts cabinet.Helps prevent down time. Should just the carrier be replaced and the bolt kept? Yeap,most likely just a carrier issue.As far as what BCM will want returned,just have to see what they say but I bet they will want the whole BCG back. |
|
Quoted:
These 14.5" mid length gas barreled upper receiver groups have been specifically tuned to be a very soft and fast shooting set up. They are a joy to shoot, but please feed it good ammo. With good milspec pressured ammo we have been running H buffers. We do not recommend using lower powered ammo. If using less than milspec pressured ammo, it may be best to run a standard carbine buffer.http://goo.gl/Dy4Wo6 Who is we? Are you associated with a specific manufacturer? I run two 14.5" Middys with H2 buffers and haven't had any issues within 18k rounds collectively with ammo some would consider under powered. Just curious is all in regards to your suggestions and testing done to come to this conclusion. |
|
Quoted:
I have a Smith Ent. carrier with a BCM bolt that would eat one gas ring if there were all three in place. After replacing one a few times, I just run it with two now. It has several thousand rounds through it like this without issue. Something isn't right. |
|
Quoted:
I have a Smith Ent. carrier with a BCM bolt that would eat one gas ring if there were all three in place. After replacing one a few times, I just run it with two now. It has several thousand rounds through it like this without issue. Yes this is no good. |
|
Quoted:
Yes this is no good. Quoted:
Quoted:
I have a Smith Ent. carrier with a BCM bolt that would eat one gas ring if there were all three in place. After replacing one a few times, I just run it with two now. It has several thousand rounds through it like this without issue. Yes this is no good. Yes, I'm sure you are both right. Its just a beater gun that runs this way and I'm not going to chase the fix. As I said it has several thousand rounds like this and continues to work so........ |
AR Sponsor