UTG 870 Optic Mount for 12 Gauge Remington 870 and 870DM Mag-Fed Shotguns, 3. 5" and Under Chamber Clearance, 6061-T6 Matte Black Anodized Aluminum, Removable 4-Capacity Shot Shell Carrier, Scalloped Full Length Pica tinny Top Rail, Access to Bead Sight Left Intact, No Permanent Modification Required