giggitygiggity
Member
- Joined
- Mar 18, 2009
- Messages
- 2,253
I have an AR that I recently put together. It has been giving me issues which I believe are due to it being undergassed. It has a 20” barrel from Classic Firearms (https://www.classicfirearms.com/arbarrel20parkerizedstraightfluted1in8heavybarrel), a Daniel Defense clamp-on style low profile gas block, an Anderson rifle gas tube, a Fail Zero NiBoron BCG, a UTG/Leapers fixed rifle stock with rifle spring and buffer, and a Midwest Industries 2-chamber muzzle brake. The upper receiver is a no-name generic receiver as is the charging handle.
I have tested it with Federal Tactical 55gr FMJ ammo and my reloads (55gr FMJ pulls with 24.5g H335 and CCI SR primers).
The rifle does better with the Federal loads. However, regardless of the ammo, the rifle fails to consistently lock open on the last round. Additionally, it has difficulty reliably firing and the chambering a new round; it usually does not jam; instead it will fire a round and then either have a dead trigger or will not cycle enough to even reset the trigger, let alone pick up a new round.
I have swapped out the lower for one with a carbine buffer tube system. I have inserted a carbine buffer in place of the rifle buffer. I have swapped out the Fail Zero BCG for an AIM NiBoron BCG. I had the same issues with a pinned generic gas tube and block which I replace with the current clamp-on Daniel Defense and Anderson combo hoping that the clamp on gas block would produce a tighter seal. I confirmed proper alignment of the gas block and barrel gas port. There is no binding as I manually cycle the action.
I left the bolt locked back for a week thinking maybe the rifle buffer spring was too strong. However, after troubleshooting, swapping parts, etc, the issues still persist.
The only other thing that I can think of is that the barrel gas port is too smakl, but I do not want to bore out a bigger gas port if I can avoid it.
If anyone has any suggestions or insight, please let me know either on this thread or via PM. Thanks!
I have tested it with Federal Tactical 55gr FMJ ammo and my reloads (55gr FMJ pulls with 24.5g H335 and CCI SR primers).
The rifle does better with the Federal loads. However, regardless of the ammo, the rifle fails to consistently lock open on the last round. Additionally, it has difficulty reliably firing and the chambering a new round; it usually does not jam; instead it will fire a round and then either have a dead trigger or will not cycle enough to even reset the trigger, let alone pick up a new round.
I have swapped out the lower for one with a carbine buffer tube system. I have inserted a carbine buffer in place of the rifle buffer. I have swapped out the Fail Zero BCG for an AIM NiBoron BCG. I had the same issues with a pinned generic gas tube and block which I replace with the current clamp-on Daniel Defense and Anderson combo hoping that the clamp on gas block would produce a tighter seal. I confirmed proper alignment of the gas block and barrel gas port. There is no binding as I manually cycle the action.
I left the bolt locked back for a week thinking maybe the rifle buffer spring was too strong. However, after troubleshooting, swapping parts, etc, the issues still persist.
The only other thing that I can think of is that the barrel gas port is too smakl, but I do not want to bore out a bigger gas port if I can avoid it.
If anyone has any suggestions or insight, please let me know either on this thread or via PM. Thanks!