ZEV Developed the Cryo Slide for end users that desire simple yet clean aesthetics. The small milled window gives you a glimpse of the barrel while reducing mass for flatter tracking and follow-up shots. On the utility side of the Cryo. You'll find the angle of the slide serrations drive your grip further into the gun, creating a solid purchase for manipulations. Features include ZEV's patented optic cut for holding a true zero, front and rear serrations and a durable, utility-focused coating.Features Machined from 17-4 Stainless steel billet Lowered ejection port to aid in ejection of brass Match grade, precision milled tolerances that are tighter than factory Improved accuracy and grouping performance upon installation Torx wrench and two sets of RMR screws (tall and short) includedNOTE: ZEV RMR Cover Plate not included. Sold separately.