100% US Manufactured and Designed. Cut for the RMSc, Sig Romeo Zero Optics and includes cover plate for use without optics. Also compatible with the Holosun 507K with light modification. Includes anodized optic cover plate for use without optics 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. Available in Black DLC & Stealth Grey Fully functional with the Glock 43 and 43X. Mfg: True Precision