SLR Synergy Sig MPX 9mm Mini Compensator 13.5x1 LH Thread Black. For Sig MPX. No Timing needed. Works on stock or cut down barrels (crush washer included for shortened barrels). Will NOT work with the SIG MPX CARBINE (MPX-C-9-KM-T). 13.5x1 LH Threading. 1.4 oz. 1.84 Overall length. .862 Diameter. Adds 1.24 inches to Barrel Length. NOT for 14.5 inch Barrels. ALL NFA Rules Apply. Specifications for SLR Synergy Sig MPX 9mm Mini Compensator 13.5x1 LH Thread: Manufacturer: SLR Caliber: 9mm Luger Threads per Inch: M13.5x1 LH Condition: New Features of SLR Synergy Sig MPX 9mm Mini Compensator 13.5x1 LH Thread: Synergy Mini Compensator 9mm. For Sig MPX. No Timing needed. Works on stock or cut down barrels (crush washer included for shortened barrels). Will NOT work with the SIG MPX CARBINE (MPX-C-9-KM-T). 13.5x1 LH Threading. 1.4 oz. 1.84 Overall length. .862 Diameter. Adds 1.24 inches to Barrel Length. NOT for 14.5 inch Barrels. ALL NFA Rules Apply. Package Contents: SLR Synergy Sig MPX 9mm Mini Compensator 13.5x1 LH Thread SLR MD-9MM-13.5-MINICOMP-MPX: Synergy Sig MPX 9mm Mini Compensator 13.5x1 LH Thread Black