The Steyr STM-556- A Rare Piston AR-15 with AUG DNA.mp4

James Reeves is in Austria at Austria Arms with Martin, checking out one of the rarest AR-15 variants you’ve never heard of: the Steyr STM-556. This rifle combines Steyr AUG DNA with an AR-15 layout—featuring a quick-change barrel, proprietary monolithic upper, a piston gas system, and some truly bizarre ergonomics. Only 300 of these were ever made for the commercial market. Is this a misunderstood military rifle, or just an expensive oddball? Watch and find out as we test it at the range and compare it side-by-side with the LMT MRP.

Thanks to Martin and the team at Austria Arms for letting us get hands-on with this unicorn.