Various sets and individual items that make up the receiver extension are all here on AT3.
The buffer tube, spring, buffer, castle nut, and the locking ring are all available for the milspec or the commercial variants.
AR-15 Buffer Tube Parts
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Midwest Industries Side Folding Picatinny Stock Adapter with Stock Tube
Midwest Industries Side Folding Stock Tube The Midwest Industries Side Folding Picatinny Stock Adapter attaches easily to firearms with a 1913 rail at the rear. This side folding adapter features...
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