SLR Synergy Comp 5.56 Mod1 California Legal 1/2x28 Thread Black. Melonite QPQ Finish. 1/2x28 threading. Overall Length: 2.47 inches. Weight: 3.2 oz. Included Accessories: Crush Washer Specifications for SLR Synergy 5.56 Compensator Mod1 California Legal 1/2x28 Thread: Manufacturer: SLR Color: Black Caliber: 5.56x45mm NATO Finish: Melonite QPQ Fabric/Material: Stainless Steel Threads per Inch: 1/2x28 Length: 2.47 in Weight: 3.2 oz Included Accessories: Crush Washer Features of SLR Synergy 5.56 Compensator Mod1 California Legal 1/2x28 Thread: 416 Stainless Steel. Melonite QPQ Finish. 1/2x28 threading. Overall Length: 2.47 inches. Weight: 3.2 oz. Included Accessories: Crush Washer Package Contents: SLR Synergy 5.56 Compensator Mod1 California Legal 1/2x28 Thread SLR MD-556-COMP-CA: Synergy Comp 5.56 Mod1 California Legal 1/2x28 Thread Black