CARVER Custom .9MM 4 port 9mm major compensator for your M&P Pro/L KKM barrel with 1/2 x 28 TPI. These comps were designed to fit the contour of the slide and to appear as an extension of the slide. The compensators are made out of tough 6061-T6 aircraft aluminum.

Benefits of this compensator include: Large expansion chamber leading into 3 retaining ports Porting on the sides, allows more air to rush into the compensator, pushing more exhaust up, allowing more control of the muzzle Comp weight 1.3 oz Guiderod channel under compensator Controls muzzle flip and recoil up to 55% dependent upon type of ammunition used. The higher power factors will deliver more efficiency. Stylish and effective!! Excellent for IPSC Major The comps are threaded for 1/2 x 28tpi barrels. Though they will fit an M&P threaded barrel that's intended for a suppressor, we recommend the use of a barrel that will allow the compensator to snug up to the end of the slide. 

Compensators will fit the following 9MM Smith & Wesson models: M&P Pro 5.0" M&P L 5.0" When using the CARVER Custom compensator system, you may need to use a lighter recoil spring to compromise the slide speed since the compensators are so efficient they are reducing the amount of energy normally utilized by the slide to recycle.

Recoil springs recommended for Major loads: 14-15 lb recoil springs. Factory 9MM factory or target loads not recommended for use with a 4 port compensator. +P Ammo "can" be used with the 4 port but will need an 11-13lb recoil springs.