Energetic Armament Vox S. Rated for: 9mm full auto, 300BLK subs and supers, 8.6BLK subsonic only, 38/357, 350 Legend (10" barrel min). No barrel length restrictions under 1,000°F. 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