This GLOCK 43 Slide is Meticulously Machined to VERY Tight, Exacting Tolerances from US made Stainless Steel! Then they are Heat Treated to increase their Hardness, Making them nearly 30% harder and Stronger than ordinary 416 Stainless Steel. X-Caliber Precision wants you to know that the guys in the shop are very dedicated to providing you with the Highest Quality, and Most Reliable Slides available. You can Rest Assured that our Slides will Last and Perform, Day After Day and Year After Year! And the Battle Worn Finish is a Fantastic Detail to Complete that 43/43X Build!