I picked this up as I wanted it to fit over a pistol length barrel with the suppressor. This handguard has a 1.8" Inside Diameter and clears an Omega 36M. The machining is great, finish is great as well. No burrs, machine marks or rough edges. I was pleasantly surprised that it also included the barrel nut shims for an AR10 spec barrel (guess I didn't need to purchase those elsewhere!). So, it comes with a pack of barrel shims, Allen wrenches, 2, for the attaching screws and the smaller spreader ****, and extra mounting screws. Only downside is yes, it's made in China (what isn't), and ships from China. It took 9 days from order to delivery, so that's not bad when US distributors have taken 4-5 days to ship an order out.