YHM's .30 caliber Resonator R2 is a quiet, lightweight and cost effective suppressor. Can be used on rifle calibers from .17 HMR through 300 RUM. Tubeless design with heat treated 17-4 stainless steel and 718 Inconel blast baffle, full auto rated. Ships with Phantom Q.D. Adapter, 2 suppressor wrenches, and YHM-4302 mount. Compatible with YHM-4302, YHM-3302 and YHM-3102/YHM-5M2 mounts. Note: If this product is reflected as in-stock it means it's either physically in-stock or allocated and available (serial number is assigned) at my distributor