Specifications: Adds 1.45a ^2 of length to the existing Stribog Handguard Machined from 6061 aluminum Includes a 9 and 3 o'clock set of M-Lok slots (Note that these M-LOK slots will not bridge to those on the factory handguard) Extends the picatinny rails on the top and bottom of the factory handguard No additional modification to the factory handguard needed Factory backup sights compatible Compatible with the SP9A1 and SP9A3 models (The SP9A1 models requires the use of the HB Industries SP9A1 Locking Charging Block) Not Compatible with the SP9A3S model Please NOTE: Stribog SP9A3 is not included and only used for photo purposes. NOTE FROM ARMS REPUBLIC: MLOK length is 1.1a ^2 instead of the standard 1.26a ^2. This was the maximum width we felt comfortable to leave proper wall thickness on each end. Some MLOK accessories will not fit.