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Posted: 6/23/2021 10:01:26 PM EDT
[#1]
His builds were all 3 on factory competed AP M4E1 lowers. The uppers were 2 Anderson and 1 aero. Barrels all 16 inch middys: 1 Roscoe bloodline, 1 BA, and one NBS enhanced. As I'm picking up my stuff I hear "Dude my mag won't go in ". He had a hexmag with abaut half full that wouldnt latch up in any of his if the BCGs were forward. We were able to get the Lancer and Pmag to go in with a stout tap on the bottom. We then proceeded to go through the same process of single or sometimes double shots in his as well as having issues just charging the weapons into battery. He had 2 other rifles one with a PSA BCG and one with an AP. We swapped BCGs again and they both ran like champs in all 4 guns.
Sorry for the long post, but in my mind these BCGs have to be out of spec somehow, or am I crazy. I've emailed the company, to see what they can do. Has anyone on here came across and issue like this before that may have any other suggestions? |
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Posted: 6/23/2021 10:04:39 PM EDT
[#2]
Sorry that I had to Do this in several parts, I've just been lurking here and it is one of my first posts. I do not claim to be a master armorer, but I have built about 50 ARs in the last year and the the only issue I have had before this was with a completed upper from a company that will not be named. Long story short I ended up having to smooth out the feed ramps on their barrel.
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Posted: 6/26/2021 1:13:24 AM EDT
[#3]
For the most part, where I see problems with B/C's, is the gas key leaks to the top of the carrier.
In off cases, it may be the carrier itself that the is slightly larger that will not allow the feed lips of a mag to lock correctly in to the mag well with the carrier forward, as well as the taper in the bolt channel not stepped the correct distance back, and tears the hell out of gas rings. But mostly, the problem I see the most, and which is an builder errors, which is not checking the carrier with key alone in the upper, to make sure that the gas tube is correctly tweaked to enter and exit the carrier key from the start. So regarding the carrier key is leaking, simple test of holding the bolt inward in the carrier, CLP around the base of the key to top of carrier on all side, then about 100lbs of compressed air into the front of the key to make sure that the key is not leaking to the top of carrier. IF the key is leaking, then either send the B/C back for replacement, or if you want to fix the problem yourself, will need to get at least new carrier key bolts from the supply, so you can lap in the key to the top of carrier and reattach to solve the leak problem. As for carriers that are too large, maybe, but most of the time its a problem with either the lower or upper out of spec, and what is causing the problems of the mag not able to lock home on a closed carrier instead. |
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