03-09-2020, 08:20 PM
Quick range report:
The 30 round magazine worked perfectly, no problems at all. The 20 round magazine did not like being used as a monopod -- this caused the feed lips to interfere with the bolt. Shooting standing with no upward pressure on the 20rd mag worked fine. I shot 70 rounds of Wolf steel cased and 6 rounds of Hornady 123gr SST (brass cased, fed fine). No time to do accuracy testing.
The extractor on my Grendel bolt is weak. I will be adding an o-ring to start, and may swap out the spring if necessary.
The best combination of buffer/spring ended up being the AR10-length spring from PSA and a standard carbine buffer.
I've modded the 20 round mag feed lip as needed to allow shooting with upward pressure on the mag. More testing to follow!
The 30 round magazine worked perfectly, no problems at all. The 20 round magazine did not like being used as a monopod -- this caused the feed lips to interfere with the bolt. Shooting standing with no upward pressure on the 20rd mag worked fine. I shot 70 rounds of Wolf steel cased and 6 rounds of Hornady 123gr SST (brass cased, fed fine). No time to do accuracy testing.
The extractor on my Grendel bolt is weak. I will be adding an o-ring to start, and may swap out the spring if necessary.
The best combination of buffer/spring ended up being the AR10-length spring from PSA and a standard carbine buffer.
I've modded the 20 round mag feed lip as needed to allow shooting with upward pressure on the mag. More testing to follow!