Bravo Company Manufacturing (BCM) Gunfighter Stock Kit — the Mod 0 stock body paired with a complete mil-spec carbine buffer stack, so you can finish out a stripped lower without hunting down individual small parts. Everything from the receiver extension back is in this kit; drop it on, torque the castle nut, and the buffer tube assembly is done.

What's in the kit:

• BCM Gunfighter Mod 0 stock body — polymer, sling QD compatible, matte-black finish
• Mil-spec (1.148" OD) carbine-length receiver extension / buffer tube
• Quick-detach (QD) end plate — accepts standard push-button QD sling swivels
• Castle nut (lock nut)
• Standard AR-15 carbine action spring
• Standard AR-15 carbine buffer (H1 weight)

Fitment: AR-15 lower receivers threaded for a mil-spec carbine buffer tube (the standard threading; commercial-spec tubes are 1.170" OD and will not fit this kit). Use a castle-nut wrench and a torque wrench to install — torque castle nut to spec and stake it. Not for AR-10 platforms or rifle-length tubes.