[Bundle] AR-15 Carbine Recoil System Builder

This Carbine Receiver Extension (Buffer Tube) bundle allows you to piece together the componentry necessary to build out the back half of your lower receiver.  A combination of buffer tube and spring is required in this assembly but ultimately you'll need all of the following components:

• Carbine Receiver Extension (buffer tube)
• Carbine Action Spring
• Castle Nut
• End Plate
• Buffer
• Buffer Retainer (optional)

Note that the PWS Carbine Receiver Extension set comes with their proprietary Ratchet End Plate and Castle Nut.  Likewise, the Geissele Super 42 action springs come with buffers.  As such:  End plates, castle nuts, and buffers aren't additionally required if you select one of these set options from PWS or Geissele.