Next Level Armament Heretic 9mm Luger Compensator/Flash Hider no Spike 1/2x28 Nextride QPQ Black. Turned from solid stainless steel bars on our lathes then finished in our rotary mills to precision tolerances. We Nextride QPQ coat and laser engrave each part for a long lasting finish. NOTE: The Sig MPX and MCX have a tapered barrel. We include an adapter collar to properly install this product on your SIG. Specifications for Next Level Armament Heretic 9mm Luger Compensator/Flash Hider no Spike: Manufacturer: Next Level Armament Color: Black Caliber: 9mm Luger Finish: Nextride QPQ Fabric/Material: 4140 Steel Gun Make: Universal Gun Model: AR-15 Barrel Material: 416R Stainless Steel Length: 2.25 in Weight: 1 lb Condition: New Projectile Caliber: .355 Caliber Package Contents: Next Level Armament Heretic 9mm Luger Compensator/Flash Hider no Spike What firearm models does the manufacturer say Next Level Armament Heretic 9mm Luger Compensator/Flash Hider no Spike is compatible with? The manufacturer says that Next Level Armament Heretic 9mm Luger Compensator/Flash Hider no Spike is compatible with AR-15Next Level Armament NLX728: Heretic 9mm Luger Compensator/Flash Hider no Spike 1/2x28 Nextride QPQ Black