The Leapers UTG universal single rail shotgun barrel mount with 3 slots is compatible with barrels and magazine tube diameter between 75"-1.1" inches around. The universal barrel mount picatinny rail for shotguns is solid aluminum construction with matte black finish. The shotgun barrel mount picatinny rail is easy to install with its two piece design for clamping directly to your shotgun barrels, magazine tube extension and lets you mount laser sights, tactical flashlights or bipod. Fits most shotguns barrels and magazine tubes perfect for Remington 870 1100 11-87 SP-10 Mossberg 500 835 Maverick 88 Winchetser 1300/1200 and many more. Compatible with firearm barrel range diameter .75"-1.1" inches around.