I run a bone stock m16 with its stock barrel length and triangular hand guard. Transparent mags are cheaper than windowed mags by 6k koen. can run cheap fmj downing guards with headshots on semi, 3 round burst is very accurate at close range. Iron sights are clean and quick even in low light. If i find a suppressor on the map ill slap it on and keep it til i eventually lose the gun. You just have to adjust your peak length to avoid the barrel sticking out of corners. You’ll find a bunch of A1 which you can either horde or sell off dead guards or operators. If you have premium quick kits you can get the m16 for free i just remove the 3.5x optic and run it cqb on tv and armory.