Mr556 BB marked upper. HK marked MR BCG. Hurricane butterfly 10.4 barrel. Geissele smr handguard. Mr556 piston/oprod. Geissele airborne charging handle. Brownells clone lower with engravings. Genuine German HK lower parts. $4500 no optics included. Will consider separating the lower and upper. Prefer cash but will entertain trades, especially for a scar16 plus cash.
