100% US Manufactured and Designed; Cut for the Shield Arms RMS Series optics (RMS, RMSc, RMSw, and SMS); Will also fit the Holosun 507K, Sig Romeo Zero, Leupold Delta Point Pro, JP Enterprises Jpoint; Slide optic cuts are made without the additional two mounting lugs to accommodate a wider variety of optics such as the Holosun without modification; Includes an anodized black optic cover plate with mounting screws for use without an optic installed; Cut from solid billet 17-4ph Certified Stainless Steel; Heat treated to spec; Attractive Side and Top Cut windows; Aggressive reduced & scalloped front; Angled rear serrations