SIG BBL P320F 9MM 5.5IN TB 1/2X28

Description

Shooters looking to run a suppressor or compensator on their P320 or P250 Full Size without sending the pistol to a gunsmith will find this Sig Sauer factory replacement barrel a straightforward solution. It drops into the same frame and slide that accepted the original 4.7-inch barrel, with the added length bringing it to 5.5 inches — which also moves more of the dwell time equation in a favorable direction for suppressed use by keeping the muzzle further forward of the host pistol’s profile.

The 1/2×28 threading is the standard pitch for 9mm muzzle devices, so any suppressor or compensator built to that spec will mount directly without adapters. Sig applies their Nitron finish to the exterior — a physical vapor deposition process that produces a hard, corrosion-resistant black surface that holds up under sustained use and resist the additional heat that suppressed fire can generate over a range session.

The barrel itself is heat-treated, which hardens the steel through the bore and into the feed ramp area, preserving the geometry that controls headspacing and reliable chambering over a longer service life. Because this is a factory Sig Sauer part built to the same specifications as the original, it headspaces correctly without fitting and maintains the lockup the frame and slide were designed around. Compatibility is with the P320 Full Size and P250 Full Size in 9mm — owners of compact or subcompact variants should confirm their specific configuration before ordering.