Originally Posted by
Scorpaznatica
I searched around and I am having trouble finding a definitive cause or solution to the issue I am experiencing. If I missed something, then I apologize for creating a superfluous thread. Feel free to link me to existing threads if they apply.
The issue:
I built the rifle a couple of months ago and have since put about 500 rounds through it. The first 400 or so went through flawlessly. More recently, the bolt seems to cycle, eject the casing, grab a new round, and then get stuck about a half of an inch short of closed. It started doing it once or twice in each 20-rd mag that I put through, but now it's doing it on almost every round. If manually pull the charging handle back a bit (not so far as cause a double-feed) and then sling-shot it, it chambers the round the rest of the way and goes all the way into battery just fine.
If I lock the bolt back and manually place a round into the chamber, it gets very stiff and difficult to push in for the last 3/8" or so. It's almost as if the casing is just too large, or the chamber bore is just too small. It didn't seem to have any issue with this in first few hundred rounds through it.
The rifle has been cleaned after every hundred rounds or so, and re-oiled before its next use. Any advice or suggestions on what could be causing this, or how to fix it?
The rifle:
Lower:
PSA Stripped Lower Receiver
PSA Magpul Lower Parts Kit
Upper:
BCM 16" Carbine-Length Upper Receiver Assembly
BCM Gunfighter Mod 4 Charging Handle
BCM Bolt Carrier Group