The BenchLoader™ loaders are heavy duty CNC machined industrial 5.56 / .223 cal magazine loaders made to load a magazine in a single hand stroke. They are intended for daily loading of hundreds of magazines at shooting ranges and armories. They totally eliminate any fingers' pain and injury, shorten loading time, and keep the magazines lips intact. Specifications: - Loads only M16 / AR15 USGI (NATO STANAG 4179) - 20 and 30 rd 5.56 / .223 magazines - Does Not load polymer magazines, like PMAG, Thermold, Orlite, SIG