The HUB2K is a modern take on the legendary M4-2000. With DMLS 3D printing in 718 Inconel, the can is stronger and lighter without sacrificing sound performance. Oversized 6mm baffles help reduce backpressure and minimize end cap strikes on SBRs. HUB standard 1.375-24 threads in the rear allow any HUB style mount. Full auto rated. 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