XCR upper. Mainly so I don't have to rezero optics just keep the optic on the rail of each upper. And secondly so I don't have to play with the barrel bolt. I think its kinda sketchy anyways.
It would be easier that's for sure. Changing to .223 from 7.62 I only had to lower the aim a few clicks. About five shots and I was on target again. It's not that bad to rezero but I hear ya.
Umm Terra my upper is defective. Ya defective that's it. Maybe you can send me a replacement?


















































