Modular when you need it to be and durable 24/7, a Nordic clamp adds strength and flexibility to your MXT extension. Nordic extension tubes are tough, but some situations just require some extra support. Whether it's just there to provide a place to attach a light or sling, or if it's the last thing standing between that barricade you just slammed your extension tube into and launching the contents of your magazine downrange, Nordic's barrel clamp gets the job done. This Clamp Kit will fit almost any shotgun. Instead of listing the models it WILL fit, we'll list the models it WON'T fit: Mossberg 590/590A1, 835, 935, or 930SPX shotguns (requires heavy-wall barrel clamp) Benelli Nova/Supernova (requires heavy-wall barrel clamp) Browning Auto-5, Remington Model 11, Savage 720/725, or any other shotguns with reciprocating barrels If your shotgun isn't listed above and wasn't made by someone in his garage, then this Clamp will probably work. Adds strength and flexibility to your MXT Extension Kit (sold separately) Provides extra rigidity for your magazine extension on shotguns with heavy/overbored barrels or large barrel-to-magazine offset Each clamp half has a centrally-located 10-32 threaded hole to accept accessories NOTE: WILL NOT FIT the Mossberg 590/A1, 835, 935 or 930SPX; Benelli Nova/Super Nova; Browning A5; Remington Model 11; Savage 720/725; or any shotguns with reciprocating barrels Order today!