The SM-22 utilizes the time-proven steel adjustable locking mechanism (tension adjustable) that allows instantaneous attachment without any compromise to accuracy. Scope mount for SAM7K, SAM7SFK, AR-M4SF, and other Arsenal SBR with peep rear sight. 2.9 of Picatinny rail play per section, 5.8 total. Low profile, one-piece, quick release, 7 railing slots forward of rear sight and 7 railing slots behind rear sight, Arsenal, Inc USA.