For the love of god fix the 1913 rail on the upper for both the gen 1 and 2. The rail isn't in spec and you can't mount an eotech exps optic on it because theres not enough clearance between the top of the receiver and the underside of the rail.
John from Wolverine knew about this in 2018 with the gen 1 and didn't bother fixing it for the gen 2 because "the gun isn't going to military trials." What a load of BS that is.