MNT- HGR16S 1. Exceptionally designed for use with AR-15, M-16 and M4 style handguards. 2. Picatinny dimensions allow for most wide range of accessory applications. 3. Attach to handguard with screws and housing adaptors for quick and rock solid installation. 4. Designed with swivel housing and complete with a swivel adaptor to allow for additional optional QD swivels or bipod installation.