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Thread: Help with new Build Issue
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18 June 2017, 10:47 #1
Help with new Build Issue PICS ADDED
I recently built an AR and am having issues. The rounds are not reliably strippingfrom the magazine and chambering. This is most prominent when trying to hamber a round by using the bolt release or manually. Didn't seem to matter how many rounds were in the magazine. Photos below. But first, build details:
Mega Arms forged lower
DSG Arms lower parts kit (including reciever extension, carbine buffer and spring)
BAD BCG (started with a brownells, but swapped it for a BAD when I thought the issue was bcg related)
Ballistic Advantage barrel
Magazines used are MOE Pmag, Troy, Lancer, Bushmaster factory and a variety of surplus/DRMO mags from the PD armory.
Last edited by tappedandtagged; 18 June 2017 at 19:17.
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18 June 2017, 11:40 #2
Have you swapped out the buffer and spring?
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18 June 2017, 11:57 #3
Only with another carbine weight (from my factory-ish Windham). Same issue.
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18 June 2017, 17:07 #4
Carrier moving too fast?
Sounds like you've swapped out the most common issues, the BCG, Magazine. I'd try a heavier buffer.
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18 June 2017, 17:41 #5
Are you saying that with an unchambered round, you can pull back on the CH let it go, not "riding it down", and it won't strip and feed a round? Let me ask you a dumb question. Having tried everything UW has recommended, is it possible you've over loaded the mag by a round? I've seen that happen so many times, it's almost common. This is one of those "I wish I could see it' things. Also, are you shooting factory loaded ammo or hand loads? Good luck to you, I'd bet it's a simple issue, you've just got find it. One of those "DOH" things, like I do.
FTNRA Life Member
Basket full of Deplorables Life Member
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18 June 2017, 19:04 #6
In my mind, there are two reasons why a round won't be picked up by the bolt:
1) short stroke - the bolt doesn't come back far enough to get behind the base of the next round
2) bolt over base - the round is just barely too low for the bolt to pick it up
#1 is a malfunction typically traced back to the gas system, including underpowered ammo, and is a very common issue
#2 is physical geometry of the weapon: magazine feed angle and the position of the magazine in the well as dictated by the magazine, machining of the lower receiver, and the magazine catch assembly. #2 is less common, but you'll be wasting your time chasing down gas system issues if it is the real culprit. It sounds like you've eliminated mags as the issue, so your next trick would be to swap out the magazine catch. I had one build where the combo of mag catch and lower just didn't reliably work. A different mag catch fixed the issue and that same mag catch worked just fine in a different lower. I seem to recall reading of a lower receiver where the machining for the mag catch was out of spec enough that there was no way to fix it short of replacing the lower receiver.
I hope that's helpful.
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18 June 2017, 19:06 #7
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18 June 2017, 19:10 #8
Yes, you're understanding correctly. I'm not riding it down. Does this with factory and reloads.
Not an overloaded magazine. When testing, I would load each mag to 30, fire, while holding the bolt release to lock the bolt back upon firing. I would then hit the bolt release to chamber a new round, through the whole 30 rounds. Sometimes it would chamber, sometimes (~20%) it wouldn't. The number of rounds did not seem to make a difference.Last edited by tappedandtagged; 18 June 2017 at 19:20.
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18 June 2017, 19:16 #9
What type of magazine? Magpul or USGI metal perhaps? If they're the metal ones the trick is to leave two rounds out. When we could have 30 rounders in N.Y. all we could have were pre ban USGI mags. Could only load 28 rounds, never 30 for them to feed properly
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18 June 2017, 19:18 #10
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18 June 2017, 19:28 #11
For starters your rifle looks way to dry. Lube the piss out of that thing, real important on a new rifle. Then while its unloaded cycle it 50-100 times to get the parts to mate up. It looks like its hanging up on the feed ramps of the barrel extension, do the bullets have deep gouges on them?
The best way to survive a violent encounter is to be the one inflicting the most violence.
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18 June 2017, 19:56 #12
Wow, I've been through this many times over. Always want to find the fiend to problem to be a simple one. Besides UW, Stickman and Stone, I would do what Stone recommend is looking at, gouges on ammo (my quepstion about factory ammo and hand loads). I'm not really a fan of lubing the shit out of it, kind of guy, unless your shooting old school phosphorous BCG's.
Hope you get it right. Lot's of guy's/gal's here to help you get it straightened out.
FTNRA Life Member
Basket full of Deplorables Life Member
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18 June 2017, 20:21 #13
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18 June 2017, 20:29 #14
Not sure where it started but back in the day people were afraid to over lube so they end up under lubing. Maybe its a carry over from the military of days gone past. I run my rifles wet even more so on a new build.
The best way to survive a violent encounter is to be the one inflicting the most violence.
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18 June 2017, 20:32 #15