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The Clamp-On Switchblock is a complete assembly with gas tube for use on barrels that are .750" diameter at the front sight. Each Switchblock model is designed for a specific caliber, barrel length, and gas system length. The Switchblock is machined from 17-4ph stainless with a durable matte black nitride finish. The unit is secured to the barrel by 2 allen head cap screws. The Clamp-On Switchblock is designed for installation by an experienced armorer or gunsmith. Supplied with gas tube, wrench, and instructions. The Switchblock cannot be installed with standard plastic handguards and does not fit under a railed or tubular handguard. Switchblock is a registered trademark of Noveske Rifleworks LLC, and is patented, US patent number 7,856,917. Made in the U.S.A.