While it's a pistol right now 
, it will eventually be an SBR so I hope this can be addressed in this forum. Additionally, the people here have a lot more experience with short barrel AR's than the general pistol group.
Situation: Factory built Noveske "Hunter" 10" upper in 300BLK. Upper included Noveske BCG, and was test fired at the factory according to Noveske and showed signs of said firing. Thoroughly cleaned while waiting for lower to arrive. Lower is a stripped Noveske "blem" with a PSA LPK that includes a pistol receiver extension, recoil spring and an "H" stamped buffer. FWIW, it has KNS anti-rotational hammer/trigger pins. Lower passes function test. Four new OD 20rnd P-Mags to distinguish between 300BLK and 5.56. Ammo was Gunn 220gr subsonic and Gunn 130gr SOST, both with mixed headstamps (Gunn Ammo) from PSA.
Symptoms: Loaded 1 subsonic 300BLK into OD P-Mag; weapon fired and ejected, bolt did not lock to rear (no surprise). Repeated with supersonic and a different OD P-mag; bolt locked to rear. Loaded 10 subsonic into 3rd new p-mag and zeroed at 50 yards by manually charging between rounds. All ten ejected, but the BCG didn't go far enough to the rear to strip a new round from the mag. Switched to supersonic in the 4th new p-mag to check the difference in POI and things went to poop. I released the BCG via the catch. Click no bang. Upon inspection, the bolt was not in battery. The gas rings were visible through the 2 holes on the side of the BC. Forward assist had no effect. Pulling charging handle to the rear revealed that the extractor had not grabbed the rim as the round was sill in the chamber. Dropped mag, released charging handle, bolt still failed to go into battery. Locked bolt to rear, pointed weapon up and round falls out. Figure it's a "bad" round, set it aside, insert mag, release bolt, same result. Load another p-mag with supersonic, same result. Load another mag with SUBsonic, same result. I took the rifle/pistol apart, nothing obvious... gas key not catching on gas tube, and I can easily push it into battery with my finger w/o a live round, significantly harder with a piece of spent brass. Wiped down and reassembled and the same issues happened though sometimes it would go into battery and fire. Tried a broken it 30rnd p-mag with about the same results. Tried a USGI from the mid-eighties and it worked the best, but was still about 50% failure. Throughout the course of the day, I could occasionally get it into battery with the forward assist, but usually not... even with "aggressive" whacks (I was getting a little perturbed by this point).
Possible Remedies?: The entire BCG is VERY tight; when placed boltface down, the weight of the carrier does not cause the bolt to rotate inside the BC; Could this be a break-in issue? The extractor has the black O-ring and insert, and it's stiff. I have a spare bolt (DPMS) that I could try? Maybe just the extractor? The BCG from my well used RRA is is significantly easier to manipulate by hand than the Noveske BCG, but I didn't them. I also have a carbine buffer (non-"H") that I could try. I don't have any different ammo; all the subsonic is from the same lot (10218) as is the supersonic (10219).
Help!
, it will eventually be an SBR so I hope this can be addressed in this forum. Additionally, the people here have a lot more experience with short barrel AR's than the general pistol group.Situation: Factory built Noveske "Hunter" 10" upper in 300BLK. Upper included Noveske BCG, and was test fired at the factory according to Noveske and showed signs of said firing. Thoroughly cleaned while waiting for lower to arrive. Lower is a stripped Noveske "blem" with a PSA LPK that includes a pistol receiver extension, recoil spring and an "H" stamped buffer. FWIW, it has KNS anti-rotational hammer/trigger pins. Lower passes function test. Four new OD 20rnd P-Mags to distinguish between 300BLK and 5.56. Ammo was Gunn 220gr subsonic and Gunn 130gr SOST, both with mixed headstamps (Gunn Ammo) from PSA.
Symptoms: Loaded 1 subsonic 300BLK into OD P-Mag; weapon fired and ejected, bolt did not lock to rear (no surprise). Repeated with supersonic and a different OD P-mag; bolt locked to rear. Loaded 10 subsonic into 3rd new p-mag and zeroed at 50 yards by manually charging between rounds. All ten ejected, but the BCG didn't go far enough to the rear to strip a new round from the mag. Switched to supersonic in the 4th new p-mag to check the difference in POI and things went to poop. I released the BCG via the catch. Click no bang. Upon inspection, the bolt was not in battery. The gas rings were visible through the 2 holes on the side of the BC. Forward assist had no effect. Pulling charging handle to the rear revealed that the extractor had not grabbed the rim as the round was sill in the chamber. Dropped mag, released charging handle, bolt still failed to go into battery. Locked bolt to rear, pointed weapon up and round falls out. Figure it's a "bad" round, set it aside, insert mag, release bolt, same result. Load another p-mag with supersonic, same result. Load another mag with SUBsonic, same result. I took the rifle/pistol apart, nothing obvious... gas key not catching on gas tube, and I can easily push it into battery with my finger w/o a live round, significantly harder with a piece of spent brass. Wiped down and reassembled and the same issues happened though sometimes it would go into battery and fire. Tried a broken it 30rnd p-mag with about the same results. Tried a USGI from the mid-eighties and it worked the best, but was still about 50% failure. Throughout the course of the day, I could occasionally get it into battery with the forward assist, but usually not... even with "aggressive" whacks (I was getting a little perturbed by this point).
Possible Remedies?: The entire BCG is VERY tight; when placed boltface down, the weight of the carrier does not cause the bolt to rotate inside the BC; Could this be a break-in issue? The extractor has the black O-ring and insert, and it's stiff. I have a spare bolt (DPMS) that I could try? Maybe just the extractor? The BCG from my well used RRA is is significantly easier to manipulate by hand than the Noveske BCG, but I didn't them. I also have a carbine buffer (non-"H") that I could try. I don't have any different ammo; all the subsonic is from the same lot (10218) as is the supersonic (10219).
Help!
