Allen Engineering AEM5-30K (Black). .30 caliber bore version of the AEM5 architecture, reinforced for larger magnum calibers. Rated up to .300 Win Mag. 304 stainless steel construction with excellent thermal stability. Tapered mount provides repeatable bore alignment and reliable return to zero after removal. Designed for precision rifle use where overall length is prioritized. 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