AR with heavy 22" kriegger

Orangeride, I agree with rdsii64; if your largest group at 200 is 1.45"; you're doing some fine shooting ! That's the groups you talked about BEFORE you sorted brass,etc. I'm in agreement, your load developement is done. Now work on doping the wind , mirage and light conditions. I had a friend, God rest his soul, who would come out to the range just when everyone else was packing up to leave. He'd set a lantern at the target to see it and shoot off a rolled up towel. Said the conditions were always the same so he knew he only had to work on the gun and load; and his ability. You just might try going to the range very late (or very early) in the day when conditions are most stable. You've apparently got the load and I believe you know how to shoot. This should give you some very impressive groups! Oh, and someone said to feed rounds singly without a mag.Not a bad idea. Charles
 
Here's a couple things to look at with the rifle itself. Take the bolt out of the carrier and slide the stripped carrier into the rifle. Check to see in the last 1/2" of travel or so if the gas tube hits excessively on the carrier key. If it does, you can tweak the tube left, right, up, down to ensure the carrier slides in smoothly without moving the gas tube excessively.

Another thing is who assembled the rifle? Ask them if they lapped the front of the receiver before installing the barrel and if they used a locking compount on the barrel extension. Normally I will use the same extension being installed on the barrel and lap that into the receiver for good contact, then after the barrel work is done I use red Loc Tite on the extension when sliding it into the receiver and a moly grease on the barrel nut threads. In talking with some equipment specialists at Rock Island, some of that information came to light in an issue Knight's Armament had with their M110's and what they did to fix it. One of those things was to epoxy the barrel extension into the receiver. Receiver fit is generally considered to be not so critical, but an accu-wedge will solve any questions with that, or you can bed the upper to the lower to remove any play.

Just some thoughts.
 
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