Is that the one that uses a standard BCG?
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the nea uses a modified bolt carrier. i believe the mvb arc stock uses a standard bolt carrier.
i've run an nea ccs stock with a number of upper's in 5.56 and 300blk and really like mine. they seem to have a like it or hate it following. if possible it's one of those things you should try before you buy if you can.
I dont see how you could get any kind of cheek weld without having the stock completely collapsed.