SLR Synergy 9mm Mini Compensator 1/2x28 Thread Black. 1/2x28 Threading. No ports on bottom to reduce ground blast. 1.84 Overall Length. .862 Diameter. Works with VG6 CAGE Device. Adds 1.24 inches to Barrel Length . NOT for 14.5 inch Barrels. ALL NFA Rules Apply. Included Accessories: Crush Washer Specifications for SLR Synergy 9mm Mini Compensator 1/2x28 Thread: Manufacturer: SLR Color: Black Caliber: 9mm Luger Finish: Melonite QPQ Fabric/Material: Stainless Steel Threads per Inch: 1/2x28 Length: 1.84 in Weight: 2.5 oz Diameter: 0.86 in Features of SLR Synergy 9mm Mini Compensator 1/2x28 Thread: Synergy Mini Compensator 9mm. 1/2x28 Threading. No ports on bottom to reduce ground blast. 1.84 Overall Length. .862 Diameter. Works with VG6 CAGE Device. Adds 1.24 inches to Barrel Length . NOT for 14.5 inch Barrels. ALL NFA Rules Apply. Included Accessories: Crush Washer Package Contents: SLR Synergy 9mm Mini Compensator 1/2x28 Thread SLR MD-9MM-28-MINICOMP: Synergy 9mm Mini Compensator 1/2x28 Thread Black