Nice looking rifle. I was doing the same thing this weekend, testing ammo in a new 6.8 build. If photobucket doesn't freeze up on me, i'll post my results later tonight.
The tube and buffer came from a Rock River A2 stock kit.scoony: Good work, the accuracy is very good. However, your ejection pattern could be improved. Ejecting at about 2:30 indicates bolt speed is too high, thereby beating up your rifle a bit more than necessary. I suggest a heavier buffer to pull the pattern back to about 4 oclock. - CW
Yes, there are makers of heavy rifle-size buffers, check heavybuffer.com for an assortment. A better solution, would be to install adjustable gas, either at the gas block, or at the gas key. See Rubber City for the latter, a simple addition to your existing bolt carrier. With that you can dial in your favorite ammo to extract and eject as you prefer.The tube and buffer came from a Rock River A2 stock kit.
I have seen mention of heavier carbine buffers, but do they make heavier rifle buffers? Going to start looking around for one.