The Foxtrot Mike Mike-9 Hybrid 9mm complete lower receiver features a hybrid aluminum/polymer lower that is reinforced in the necessary areas for strength and durability. It has premium features like ambidextrous controls, a patented last round bolt hold open, and the ability to store an spare magazine in the grip. It's truly unique for all the right reasons! -Glock magazine compatible -Ambidextrous controls -Hybrid Aluminum/Polymer -Made in the USA -Lifetime Warranty Mfg: Foxtrot Mike Products