01. BT - 4 Player Parts Kit

02. BT 4 Rip Clip Electronic Loader

03. BT-4 Double Trigger Kit with Guard

04. BT4 Electronic Frame

05. BT4 Expansion Chamber (Magazine Style)

06. BT -4 Master Parts Kit

07. BT 4 Spring Kit

08. BT Sealed Bolt System

09. BT-16 Barrel Bipod Adapter

10. BT 16 Barrel Bipod (Req's BT 16 barrel kit)