US ARMS lowers are compatible with all mil-spec lower parts kits and mil-spec upper receivers, and features our new Gen II billet design lower receiver. All of our models come with a mil-spec aluminum carbine buffer tube and a 3.0oz AR-15 carbine buffer w/ AR-15 carbine buffer spring.
US ARMS LOWER MODELS:
The Patriot-15 model is ultra lightweight lower with our polymer P-15 ® trigger group. It comes with a collapsible M4 style carbine buttstock and M16A2 grip. Features US ARMS engraved aluminum buffer tube.
The Patriot-15 II model offers a steel, mil-spec trigger group and hardware. It also comes equipped with an upgraded, ergonomically styled DMR pistol grip along with a lightweight collapsible micro M4 style carbine buttstock, and features US ARMS aluminum buffer tube.
The Skadi features an upgraded, collapsible SOP MOD style buttstock and an ergonomically styled DMR pistol grip. This lower is lightweight and is assembled with our polymer P-15 ® trigger group. This model features a Skadi engraved aluminum buffer tube.