SIG BBL P320SC 9MM 4.3IN TB 1/2X28

Description

The Sig Sauer P320 threaded barrel in 9mm is built for shooters who want to run a suppressor or compensator on a P320 Compact, Subcompact, or Carry-framed pistol. Where the factory barrel ends flush with the slide, this one adds threaded length past the muzzle, giving you a mounting surface without requiring any permanent modification to the pistol itself.

Installation is straightforward: with the firearm unloaded, separate the slide from the grip module and swap the barrel directly — no tools, no fitting. The design is compatible with both standard and X-series P320 Compact, Subcompact, and Carry variants, with one important caveat: it is intended for pistols without a loaded chamber indicator. If your slide has an LCI port, this is not the correct barrel. A thread protector is included to protect the muzzle crown and threads when running without an attachment.

The 1/2×28 thread pattern is the standard for 9mm suppressor hosts and most muzzle devices chambered for this caliber, so finding compatible accessories is straightforward. The Nitron finish on the barrel resists corrosion and is consistent with Sig’s standard on production P320 components. This is a drop-in upgrade that meaningfully expands what your P320 platform can do without touching the rest of the pistol.