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Posted: 3/6/2021 5:48:18 PM EDT
[Last Edit: Firestarter123]
I got the gun put together with the 8.5" barrel but noticed the case is unsupported more than my other barrels after shooting it a bit. I also received a 10.5" barrel today.
Both barrels are like this. I only have a QC10 and a BA barrels for comparison. It also seems that when I drop a round (factory or reload) it sticks in the chamber. ETA: I case gauge every round that I reload as my final QC step.  Attached FileAlso had this so I'm done for the day.  Attached File |
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Posted: 3/6/2021 6:06:59 PM EDT
[#1]
I would say no, that is not normal but I don't now exact specifications of function for that weapon. The absence of a fully supported chamber seems bad for any weapon. Without a fully supported chamber definitely wear eye pro and gloves.
I see an AR style charging handle and bolt cutouts minus M-4 feedramps. What is it? |
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Posted: 3/6/2021 6:15:53 PM EDT
[Last Edit: Firestarter123]
[#2]
Quote HistoryOriginally Posted By GLD1980: I would say no, that is not normal but I don't now exact specifications of function for that weapon. The absence of a fully supported chamber seems bad for any weapon. Without a fully supported chamber definitely wear eye pro and gloves. I see an AR style charging handle and bolt cutouts minus M-4 feedramps. What is it? Happily I always wear eye protection when shooting. This is the build: CMT dedicated 9mm upper BCM MOD4B charging handle CMMG bolt MI Combat Rail Macon 8.5" barrel Aero lower Hahn Dedicated block Spike's 9mm Buffer Standard carbine spring Stag LPK KNS pins ETA: The other odd thing is that the first round of every mag seemed much softer than the rest. I tested it against my other 9mm rifle with the QC10 barrel and that didn't happen. I also used this guns lower on the QC10 upper and it didn't happen. |
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ND, USA
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Posted: 3/6/2021 7:12:59 PM EDT
[#3]
Lead bullets? Poorly made ammo with lead projectiles will lead the chamber throat and cause a problem.
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Posted: 3/6/2021 7:15:02 PM EDT
[Last Edit: Firestarter123]
[#4]
Empty sized case:
 Attached FileFactory Federal 115gr FMJ:  Attached FileFactory 147gr Hornady XTP:  Attached FileReloaded 115gr Montana Gold FMJ at 1.125" OAL:  Attached FileBallistic Advantage barrel in same order as above:  Attached File Attached File Attached File Attached File |
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Posted: 3/6/2021 7:15:41 PM EDT
[#5]
Quote HistoryOriginally Posted By Mindless: Lead bullets? Poorly made ammo with lead projectiles will lead the chamber throat and cause a problem. Nope. All are jacketed. |
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Posted: 3/6/2021 7:29:45 PM EDT
[#6]
Send an email to the barrel manufacturer and ask them if this is to spec. Show them all pics especially the bulging blownout case and I'm sure they will send you a new barrel or fix yours. Good luck. Report back if you do. Take care.
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Posted: 3/6/2021 7:34:49 PM EDT
[#7]
Macon Armory is who made it so I posted here.
I'll send an email too though I guess. |
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Posted: 3/6/2021 7:57:13 PM EDT
[#8]
Quote HistoryOriginally Posted By jlficken: Macon Armory is who made it so I posted here. I'll send an email too though I guess. Just saw what forum group we are in. I would still email unless they contact you by Monday. |
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Posted: 3/6/2021 8:30:21 PM EDT
[Last Edit: Firestarter123]
[#9]
I just thought to try the bolt with the barrel and see what it looked like.
Macon barrel with factory ammo: Federal 115gr FMJ  Attached FileHornady 147gr XTP  Attached FileBallistic Advantage same order:  Attached File Attached File |
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Posted: 3/6/2021 9:57:11 PM EDT
[#10]
Damn, good problem solving. You seem to have narrowed down and found your problem. Worse things have happened to gun owners from a kaboom. Thankfully your fine, the gun is fine, and the barrel is fine for inspection not split. How is your bolt?
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Posted: 3/6/2021 10:15:11 PM EDT
[#11]
Yeah I'm happy that nothing bad happened as well.
Surprisingly nothing appears to have happened to the lower, bolt, magazine, Hahn block, or anything else. I looked everything over multiple times to make sure. I'm more annoyed that I didn't notice it before but I just didn't notice that the bolt wasn't going completely forward beforehand. |
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Posted: 3/6/2021 10:50:34 PM EDT
[#12]
I have never checked either. Not sure why but if everything looks good and passes a function test and an ammo cycling test I'll take it to the range.
Aside from disassembling a brand new firearm to properly clean, adjust, straighten, tighten, oil and loctite. I've never checked the throat for seating issues just obstructions or visible machining issues. After your post from here out I will. I just checked my Stribog earlier before commenting on your post. I'm sure the manufacturer will have your back. Take care. |
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Posted: 3/6/2021 10:56:14 PM EDT
[#13]
I'll be checking from now on too.
I figured out the way the brass was in the bolt when the OOB occurred due to an extractor mark from when the round was extracted (it did it on its own). I'm guessing this is why the bolt didn't get damaged.  Attached File |
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Posted: 3/6/2021 11:04:41 PM EDT
[#14]
Did you find that little blown out piece? Its probably embedded into the upper or lower reciever somewhere, j/k.
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Posted: 3/6/2021 11:13:21 PM EDT
[#15]
Quote HistoryOriginally Posted By GLD1980: Did you find that little blown out piece? Its probably embedded into the upper or lower reciever somewhere, j/k. No it's gone. The brass was 3-4ft in front of the bench. It must have ricocheted somehow. |
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Posted: 3/7/2021 6:55:33 PM EDT
[#16]
Definitely unusual......every barrel in that batch was gauged prior to going to nitride......I'll give you a shout by phone....
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Posted: 3/9/2021 10:31:18 AM EDT
[#17]
Rudy, you get it figured out.
I just saw this after I placed another order for barrel and buffer this morning. LOL |
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Posted: 3/9/2021 11:03:01 AM EDT
[#18]
Quote HistoryOriginally Posted By MAZDOG: Rudy, you get it figured out. I just saw this after I placed another order for barrel and buffer this morning. LOL It sounds like there was a wire edge left by the reamer and he knows how to fix it so you should be fine. It was odd as some ammo it would have a problem with while others it wouldn't. I sent along a couple of rounds from 3 different factory loads (115gr, 124gr, and 147gr) for him to verify as well. My barrels are on their way back to get fixed. He was very apologetic and gracious in getting them fixed ASAP. |
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Posted: 3/9/2021 11:25:33 AM EDT
[#19]
Thanks for update.
No doubt Rudy is a great guy. I had him fix a barrel from another manufacturer several years ago before he had his own line. I still have the smile on my face of him letting me shoot one of his AR45's.  Bought several items from him.
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Posted: 3/15/2021 11:35:47 PM EDT
[Last Edit: Mad-Machinist]
[#20]
This is handled........while I was able to hone the OP's barrels and they run fine....I made a clamp collar for a new reamer and have been running a brand new reamer in the chamber on the lathe and simply chasing them. Chambers are looking awesome and 147's are NOT an issue
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Posted: 3/15/2021 11:42:12 PM EDT
[#21]
Thanks for everything Rudy!
It's back together and I can't wait to try it out. Your buffer looks very nice as well and I'll be using it and ditching my other buffer as the bumper is a soft rubbery material it appears and was deforming already. I'll update this once I get a chance to shoot it but I'm not worried. I'm getting pretty quick at assembling 9mm uppers
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