Quoted: Stephen, What type of upper are you shooting?
Jim
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The rifle was a home build. Originally, it was all Bushmaster except for the 16" Model 1 Sales C.A.R. barrel and bolt. I got the chrome lined barrel. After extensive shooting of a variety of rounds I sent it off to John Holliger at White Oak Armament to have a few details changed. The biggest was to have a M4 feed ramp barrel extension and receiver added for feeding reliabilty. The 6.8mm just isn't 100% without them. I also got one of their bolts. I added a PRI low-pro gas block, vortex FH, etc.
It has taken a year and a half of shooting 6.8mm for the ammo to just now be plentiful. There were several times in that period where I very seriously considered having it rebarreld to 5.56mm. Now that ammo is plentiful, it is my absolute favorite AR15 (of 4 of them), and my favorite gun period, to shoot. I like and recommend the Silver State ammo. Their Matchking load is awesome and their customer service is the best in the business.
If I were to do it over again right now, I'd probably get that mid-length barrel that CMMG is offering. I might do that anyway as it seems like great barrel/upper at a great price.
Hope this helps.
Stephen