Presma Inc M-LOK to ARCA Rail Adapter Versatile Compatibility : The Presma Inc M-LOK to ARCA Adapter Rail is designed to attach seamlessly to standard M-LOK slots, providing options for standard ARCA, R-LOCK, and MRAS QD adaptor mounts. Multiple Lengths Available : Choose the perfect length to suit your needs, ensuring a customized fit for your firearm setup. Robust Construction : Crafted from high-quality A6061-T6 aluminum, this adapter rail is built to last. The anodized finish adds an extra layer of durability and resistance to wear. Complete Mounting Kit : Includes M-LOK screws and nuts for easy and secure installation. Enhanced Functionality : Upgrade your firearm with this adapter rail, offering enhanced versatility and compatibility with various mounting options.