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Have a unique, repetitive failure on an AR15 that I have not seen before and have no idea how to shade tree a repair.
DelTon lower, 556, less than 500 rounds through it.
Dissipator pattern upper, same age, pretty sure it is also DelTon but I forget for sure and am not finding markings immediately.
On a 30 stack, rounds 1,3,5 and sometimes 7 from the left side of the magazine are not stripping into the chamber but are jamming in the locking assemblage for the bolt face. If I pull the charger on good ammo, the bolt will drive the round home. On cheap ammo it will drive the slug into the brass and distend the throat enough to jam the bolt closed.
After getting through these rounds, the system feeds and functions normally
This is repeated in a 10 stack on round 1 only. Repeated regardless of magazine.
Any AR guys can point me at a possible why and fix I would appreciate it. Unfortunately Fergusons BS is preventing me from simply replacing it.
DelTon lower, 556, less than 500 rounds through it.
Dissipator pattern upper, same age, pretty sure it is also DelTon but I forget for sure and am not finding markings immediately.
On a 30 stack, rounds 1,3,5 and sometimes 7 from the left side of the magazine are not stripping into the chamber but are jamming in the locking assemblage for the bolt face. If I pull the charger on good ammo, the bolt will drive the round home. On cheap ammo it will drive the slug into the brass and distend the throat enough to jam the bolt closed.
After getting through these rounds, the system feeds and functions normally
This is repeated in a 10 stack on round 1 only. Repeated regardless of magazine.
Any AR guys can point me at a possible why and fix I would appreciate it. Unfortunately Fergusons BS is preventing me from simply replacing it.