In an attempt to glean as much information as possible for my upcoming 16 purchase I want to focus on bullet weights for my 16's configuration and PoU. The barrel will end up 14?" but 16.1" OAL with brake/adapter and will sport a suppressor (Surefire SOCOM556-SB) as soon as I complete the Trust, submit paperwork and endure stamp wait times. The PoU will be primary SHTF, range fun and pistol/carbine competition. The research conducted to date shows the 77gr Mk262 or 62gr Mk318 Mod 0 to be top performers from a short barrel, I would also prefer to stock one cartridge in 5.56 it just makes life a little easier. Any suggestions?