The Rival Arms Build Kit Glock 17 Gen 4 RMR Cut is the perfect kit to start any project. The kit includes a Rival Arms custom coated slide with an optic cut cover. It also includes a matching magwell for improved mag changes. This kit also ensures you are ready to shoot with the added precision barrel for increased accuracy. The stainless steel guide rod adds durability and the slide completion kit ensures the internals are up to the same Rival Arms quality.