Elevate your Colt 1911 to modern standards with these high-performance optics plates engineered for seamless mounting of red dot sights. Shield RMSc/Holosun 507k Footprint Plate: Supports Shield RMSc and Holosun 507k series optics (e.g. Holosun 507k X2) providing a compact low-profile solution ideal for concealed carry setups with an integrated Glock dovetail rear sight cut for enhanced sight alignment.