Mountain Arms

We started out as a couple of guys with extensive knowledge of AR type rifles and wanted something a little different. We had a friend who had an old injury that prevented him from being able to shoot a magnum rifle due to the recoil. That's where the idea for the .300 WSM in a .308 style AR came from. We started there and have been going strong ever since.

We are based in Northern California but can ship an upper receiver anywhere in the U.S.

If you have an idea for your dream AR, no matter if it is built on the larger .308 platform or a standard AR-15, contact us and we will do our best to make your dreams come true.