Allen Engineering AEM3 (Black, Ops 15th Model). 5.56mm compact suppressor. Adds only 3.4" past the brake (~4.9" from muzzle). Comparable to many K-length suppressors in size but performs closer to full-length cans. Fits barrels as short as 11.5" with standard low-profile gas block, or 10.5" with tapered gas blocks. Compatible with standard AE/OPS brakes and collars. 7-10 turns for best fitment. 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