Post by bldsmith on Aug 8, 2014 19:02:11 GMT -8
I finished up my 264 LBC build a couple weeks ago and finally was able to take her out to the range last week. Her she is (need to come up with a name),
20" BHW barrel 1/8 twist. Type 1 Chamber
Spikes lower CMMG LPK Timney 3#trigger
Anderson upper, Nickle Boron Nitride Bolt Carrier, Tactical Ammunition Type 1 Bolt.
Magpul STR Milspec stock, Milspec Buffer and tube with standard spring.
Nikon Monarch 4-16 glass.
5/8-24 thread protector.
Here is the problem, I was unable to get his thing to group worth a darn. A can get 2 very close then the next few will be 4 inches way. I purchased some Black Hills 123amax loads from Les Bear. I got a group of 4 within 1" but that was the best I could do. Here is a typical tgt.
To be fair I did make and adjustment after the first 4 shots in the lower left. Still not what I was expecting. I did a break in as described, 5 shots clean for 60 rounds and this is what I am getting after 80. Can anyone make an educated swag as to what the problem might be?? I thought it might be a bolt carrier gas key problem. It seemed to be shifting. I bought a blemished bolt carrier and the key did not seem to fit as well as others. I went ahead and picked up a new complete bolt carrier group and changed out the bolt. Above was the first of 2 tgts. I have been pulling my hair out trying to figure this out. (and I don't have enough to spare) I re-torqued the barrel nut. Checked the scope and base for rigidity. I have been at a loss. I have the ability to make good groupings. Here's one from my 308
Help
20" BHW barrel 1/8 twist. Type 1 Chamber
Spikes lower CMMG LPK Timney 3#trigger
Anderson upper, Nickle Boron Nitride Bolt Carrier, Tactical Ammunition Type 1 Bolt.
Magpul STR Milspec stock, Milspec Buffer and tube with standard spring.
Nikon Monarch 4-16 glass.
5/8-24 thread protector.
Here is the problem, I was unable to get his thing to group worth a darn. A can get 2 very close then the next few will be 4 inches way. I purchased some Black Hills 123amax loads from Les Bear. I got a group of 4 within 1" but that was the best I could do. Here is a typical tgt.
To be fair I did make and adjustment after the first 4 shots in the lower left. Still not what I was expecting. I did a break in as described, 5 shots clean for 60 rounds and this is what I am getting after 80. Can anyone make an educated swag as to what the problem might be?? I thought it might be a bolt carrier gas key problem. It seemed to be shifting. I bought a blemished bolt carrier and the key did not seem to fit as well as others. I went ahead and picked up a new complete bolt carrier group and changed out the bolt. Above was the first of 2 tgts. I have been pulling my hair out trying to figure this out. (and I don't have enough to spare) I re-torqued the barrel nut. Checked the scope and base for rigidity. I have been at a loss. I have the ability to make good groupings. Here's one from my 308
Help
. The thread protector is just knurled with no flats to wrench tighten. I will be milling a set of flats for it until I can get a muzzle device. 
