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The SB-PT is specifically designed for a perfect fit with the Sig Tac SB15 TM Pistol Stabilizing Brace.

Technical Specs
Patent Pending design.
Specifically designed for a perfect with the with Sig Tac SB15 Pistol Stabilizing Brace (Sig Tac SB15 not included).
Unique locking collar prevents SB15 from rotating and moving forward.
10.5” – 14.5” length of pull.
Matte black Type III hard anodize finish.
Receiver end plate designed with ambidextrous sling attachment points and QD mount (no Castle Nut required).
Weight: 4.8oz
Uses standard carbine buffer and carbine buffer spring.
Includes: Pistol buffer tube, locking collar, receiver end plate, hex wrench.