I finally finished my first Grendel build with the help of a few friends and took it out yesterday to the range. Started at 25 yards to get on paper and it only took 5 shots to get 2 on top of eachother. Had no problems and seemed to run flawlessly ejecting with good trajectory.
Then I moved to 50 yards and after some quick adjustments for bullet rise, shot this group of 5.
I was very happy, although I knew it was only 50, so then stretched it out to 100, and that was where I started having issues (although I know the change in distance wasn't what caused it).
After my first shot at 100, it ejected, but did not load a new round. I racked the CH back, fired again, and the same thing happened again. From here on out, it always ejected, but never picked up the next round off the mag. I tried several different magazines to rule that out as well, but no luck.
My first thought was undergassed, but it didn't quite make sense with the first 15 rounds fired. I also had done some reading when building about the difference when running a rifle length gas system with a carbine buffer/spring, so i thought it might have been an issue there. Because I originally had an ACE Skeleton stock on the Grendel, I used the rifle buffer spring with a carbine buffer after reading about the combo on arfcom. That is what was in it to begin with, so since I had issues, I swapped in a standard carbine spring and buffer and tried those. Still ejected, but would not pick the next round up. I am under the impression that I can't use a rifle buffer in the carbine length tube without high risk of it cracking the rear.
So here's my setup:
20" BHW Medium Heavy barrel
Rifle Length Gas System- Did not open up the port at all
Centurion Gas Block
Rifle Buffer Spring and Carbine Buffer
RGuns BCG
Any help or tips would be greatly appreciated, as this is going to be my hunting rifle and deer season just opened here in Oregon. The accuracy is not an issue, because even manually racking it every time, I am shooting sub-MOA groups, but I want to get the reliability down. Thanks!!
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