MAC 9 Upper Rifle Kit

MAC 9 Upper Kit W/ AR Handguard Adapter MAC 9 Upper Kit W/ AR Handguard Adapter VMAC9-502c Upper Received AR Handguard Adapter Side Cocking 16.7 Barrel 1:10 Twist 1/2x28 Thread MAC 9 Upper Rifle Kit. This kit features a MAC 9 9mm upper receiver with a 16.7 barrel. The barrel has a 1:10 twist and is threaded 1/2x28. This kit includes everything that is pictured, (Upper, Bolt Assembly, and Side Cocking Handle. All parts have a manganese phosphate finish. Grab your kit today.