Rifle Barrel (M16A2/4 barrel) - +8 acc, +12 stb, -3 con. Overwrites the default M4 handguard with an upper half of an M16A2 round handguard.
2 handguard options:
Vintage Foregrip (M203 Heat Shield)
Queen Foregrip (KAC M5 RAS)
1 grip option: Retro Grip (A1 grip)
2 upper options (overwrite the way scopes are mounted):
Retro Upper (A1 upper)
Not-So-Retro Upper (A2 upper)
1 extra option (requires either of the 2 aforementioned upper receivers):
Gooseneck Mount - overwrites the way scopes are mounted once again. Check Known issues section for additional info.
2 stock options (+8 stb, -2 con):
Retro Solid Stock (M16A1 stock)
Solid Stock (M16A2/4 stock)
Known issues:
Gooseneck Mount seems to work only for the first upper receiver that was installed along with the mount (A1 + gooseneck mount were installed first - A2 upper is broken, and vice versa).