About 5 years ago, I bought a stripped upper and a 16" button rifled barrel and bolt from Alexander Arms. I promptly built up the AR with the intent of using it for deer and pig hunting.
Since I rarely hunt, the rifle sat in my safe unshot for the past 5 years. I finally have a deer hunting trip coming up, so I decided to dust off the Grendel AR, sight it in, and get it ready for the trip.
Unfortunately, it seems to have terrible accuracy and precision. I decided to start off with Wolf 120 gr FMJ to foul the barrel and begin the break-in. I wasn't impressed with the groups, but I attributed that to the cheap Wolf ammo. Once I thought I had it sighted in, I switched to Hornady 123 gr SST's for some fine tuning since that will be the round I'll hunt with.
The best I could do with the SST's was about 4 MOA. At least the group was centered around the POA. So I decided to try 120 gr Hornady AMAX to see if my accuracy and precision improved. The AMAX shot about 3 MOA, but it was 3 inches low and right.
So I tried some Wolf 123 gr SP's. They were about 5 MOA and were 5 inches high and right. I went back to the original Wolf 120 gr FMJ, and they shot 5 MOA and were 4 inches right.
I went home scratching my head. It was the worst performing AR I've ever built.
I went back to the range a few days later with my sled to make sure I wasn't the problem. I basically duplicated the shooting performance of my original outing. So the problem wasn't me. I asked a good friend to shoot it and his shooting confirmed once again the original findings.
I've always heard rave reviews of these AA Grendel barrels, so I'm at a loss to explain my results. I'm considering removing the AA flash hider to see if it's the problem. I also bought some AA 129 gr SST's to try. I'm still looking for some Wolf 100 gr to test also.
Does anyone else have any ideas what the problem could be?
I could tear it down and rebuild it as a last resort, but I'm not sure that would accomplish anything.
Since I rarely hunt, the rifle sat in my safe unshot for the past 5 years. I finally have a deer hunting trip coming up, so I decided to dust off the Grendel AR, sight it in, and get it ready for the trip.
Unfortunately, it seems to have terrible accuracy and precision. I decided to start off with Wolf 120 gr FMJ to foul the barrel and begin the break-in. I wasn't impressed with the groups, but I attributed that to the cheap Wolf ammo. Once I thought I had it sighted in, I switched to Hornady 123 gr SST's for some fine tuning since that will be the round I'll hunt with.
The best I could do with the SST's was about 4 MOA. At least the group was centered around the POA. So I decided to try 120 gr Hornady AMAX to see if my accuracy and precision improved. The AMAX shot about 3 MOA, but it was 3 inches low and right.
So I tried some Wolf 123 gr SP's. They were about 5 MOA and were 5 inches high and right. I went back to the original Wolf 120 gr FMJ, and they shot 5 MOA and were 4 inches right.
I went home scratching my head. It was the worst performing AR I've ever built.
I went back to the range a few days later with my sled to make sure I wasn't the problem. I basically duplicated the shooting performance of my original outing. So the problem wasn't me. I asked a good friend to shoot it and his shooting confirmed once again the original findings.
I've always heard rave reviews of these AA Grendel barrels, so I'm at a loss to explain my results. I'm considering removing the AA flash hider to see if it's the problem. I also bought some AA 129 gr SST's to try. I'm still looking for some Wolf 100 gr to test also.
Does anyone else have any ideas what the problem could be?
I could tear it down and rebuild it as a last resort, but I'm not sure that would accomplish anything.
Comment