Designed to fit the Stribog SP9 models with MLOK receivers. The SRX6 was developed with the same mindset as the MREX rail lineup. Made from strong 6061-T6 aluminum, this durable receiver extension was built for comfort and ergonomics. The added 3 inches gives you an enhanced grip further down the Stribog while providing plenty of real estate for added accessories. The SRX was also designed around the option of adding a variety of suppressors, with plenty of ventilation to ensure a comfortable, cool grip even after extended suppressor use. SPECS: Length: 9.8 in Rail weight: 7.7 oz Overall weight: 9.7 oz Finish: Anodized black type 3 hard coat or FDE cerakote Mfg: Kinetic Development Group Llc