The problem with NIB is that while sure its great internally, its noticeably slick on the outside. Like racking my girls 42 with NIB slide is kind of a pita.
The purpose of my build, along with one of Darth's and a few others around here, was to not have adjustable crap on our rifles. More crap to break or go wrong.
DD BCG and VLTOR A5 rifle length tube and A5-3 buffer. Darth might have to correct me on wording or vernaculars here but thats my understanding lol. He and Wallace were the brains behind my build :)
I cant help much with the second part. But I have only run my Sionics unsuppressed so far with no issues. Plenty of gas to cycle the action. Gonna need @Wallace and @DarthVader to help with the detailed stuff youre asking though.
Well I have the hybrid bolt. But the upper is kinda old now. The bolt was replaced a month or so ago when the original one broke.
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Well I dont like that I have 9mm glocks and mags galore that I cant use in my SBR. I also dont really like the build quality and reliability of the PSA magwell block. It kinda blooooows.