I'm in the process of building a 300 BLK AR pistol. Since I finished this pistol, I've had failure to feed/eject issues.
First, the specs:
The lower is an 80% build with BCM trigger group.
The upper is a Ghost Firearms 10.5" Elite with their Titanium Nitride BCG.
Buffer tube & spring are from Midwest Industries.
All mags are 20 and 30 round Gen3 PMAGs.
All ammunition is factory-made.
I first started off using supersonic MacTech 123gn ammo. This ammo worked flawlessly.
I then switched to subsonics (Remington 220gn AMAX, American Eagle 220gn, Hornady Black 208gn)
At all of the subsonics are either not fully ejecting the empty cartridge, or ejecting the fired cartridge, but not bringing the bolt back far enough to pick up the next round.
So I'm thinking my buffer spring was too strong. This sounded logical, so I switched the buffer spring out for a NEMO .300 BLK carbine buffer spring.
Now, with the NEMO spring, after the first round is fired, the next round is stripped from the mag, but the BCG does not fully get into battery, about 1/4-1/8" short. The forward assist won't budge it, and its a PITA to extract. Almost like this spring is not powerful enough to fully chamber the next round? But I don't know why its locking up so tight.
Anyone have any suggestions to make next? I have a call into Ghost to see if they have any comments, but thought I'd see what INGO says as well.
Thanks in advance.
First, the specs:
The lower is an 80% build with BCM trigger group.
The upper is a Ghost Firearms 10.5" Elite with their Titanium Nitride BCG.
Buffer tube & spring are from Midwest Industries.
All mags are 20 and 30 round Gen3 PMAGs.
All ammunition is factory-made.
I first started off using supersonic MacTech 123gn ammo. This ammo worked flawlessly.
I then switched to subsonics (Remington 220gn AMAX, American Eagle 220gn, Hornady Black 208gn)
At all of the subsonics are either not fully ejecting the empty cartridge, or ejecting the fired cartridge, but not bringing the bolt back far enough to pick up the next round.
So I'm thinking my buffer spring was too strong. This sounded logical, so I switched the buffer spring out for a NEMO .300 BLK carbine buffer spring.
Now, with the NEMO spring, after the first round is fired, the next round is stripped from the mag, but the BCG does not fully get into battery, about 1/4-1/8" short. The forward assist won't budge it, and its a PITA to extract. Almost like this spring is not powerful enough to fully chamber the next round? But I don't know why its locking up so tight.
Anyone have any suggestions to make next? I have a call into Ghost to see if they have any comments, but thought I'd see what INGO says as well.
Thanks in advance.