Cabela's AR-15 Triple Rail Mount -
The TRM3 combines a single 3" Picatinny rail with two, 2-1/2" 45° Picatinny rails to provide simple light operation while using a vertical grip and light mount. Rails can be used independently of each other, do not interfere with iron sights and mount easily to standard upper or lower handguards. Constructed of durable, high-density polymer. Fits M-16, AR-15 and M4.
Dimensions: 3"L x 2-3/4"W x 1-1/2"H.
Weight: 3 oz.