Microtech’s small arms division, MSAR, has ceased operations. Microtech Small Arms Research, or MSAR, manufactured variants of the Steyr AUG for the US civilian market starting in 2007. They announced their closure in a March 20 letter to their customers:

MICROTECH SMALL ARMS RESEARCH

| 3.20.15 |

It’s been quite the journey. We set out to share our passion for firearms with the industry and deliver an advanced, American-made bullpup rifle and accessories.
Knowing that our focus and energy lately has been directed towards the expansion and evolution of our 20-year knife line, we no longer felt it sustainable for MSAR to remain an active entity in our holdings.
That being said, we’ve begun to liquidate our remaining inventory. The existing inventory will be packaged into parts kits and sold on a limited basis. Contact and ordering information for those kits will be made available in the coming weeks. Repair services have been disabled with the release of this announcement. Rifles currently in our posession will be repaired and returned to the owners.
As the MSAR project comes to a close, arrangements will also be made to offer purchase options for our existing tooling to qualified buyers. Parties who wish to have their interests considered should submit a formal request, including a letter detailing qualifications and a minimum of three (3) industry references to tooling@msarinc.com. Please note that we will not be responding to any service inquiries or general questions sent to this account.
We learned many years ago that our customers are our lifeline; we thank you,, for your tireless loyalty and support of the MSAR line. You’ve given us the chance to explore the world of firearms on a new level, and for that, we’ll be forever grateful.

– The MSAR Team

It’s an unfortunate fact for those making alternative weapons that we live in a time where some models of AR-15 can be purchased for less than $600. In a market like that, the higher end rifles like those MSAR was making will struggle to find a niche. Sadly, MSAR was devoted to that kind of product, and it’s not all that surprising to me that they’ve had to close their doors. I certainly hope the US-made AUG does not die out with MSAR; maybe another enterprising company will purchase the tooling and continue production of those rifles.

Aftermath Gun Club has some additional information on MSAR, including some products that never made it to the market. I recommend readers click through and check it out.
Thanks to Daniel for the tip.