553-02-5 553 Handguard Frame
553-12 553 HOP-UP Set & Chamber
553-17-2 553 Charging Handle Catch
553-22 553 Trigger Set
553-24 553 Push Pin Set
553-25 553 Hammer
553-27 553 Bolt Lock Set
553-23 553 Magazine Catch
553-09 553 Bolt Cover
553-11 553 HOP-UP Bucking & Nub
553-12-1 553 Chamber
553-12-2 553 HOP-UP Set
