Otter Creek Labs A-10 7.62. SpiralTech baffles with built-in flash hider. H900 heat-treated 17-4 stainless steel. Internal reinforcing rings increase turbulence and strengthen construction. 1.375x24 universal QD threads for wide mount compatibility. Includes Grade 5 titanium direct thread mount (+1.5oz, +0.20" length). Minimum barrel lengths: 8" for 7.62 BLK, 16"/22" for magnum cartridges. 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