The M17S556 was designed by Ken McAllister, based on his past experiences of modifying Bushmaster M17S rifles.
The production company, K&M Arms, is a subdivision of K&M Aerospace, a machining and gunsmithing company started by Ken McAlister in 2003.
The design of the K&M M17S556 is based on the same design of the original Armstech / Edenpine M17 assault rifle to which the Bushmaster model is licensed from.
The M17S556 uses a short stroke gas piston, located above the barrel, and AR-18-style bolt carrier with three-lug rotating bolt. The charging handle is non-reciprocating, and can be mounted to either side of the gun.
The upper and lower receiver are made from aluminum alloy and are connected by cross pins. The weapon features many AR-15 compatible parts, including the hammer and the pistol grip.
The manual safety is a cross-bolt button above the trigger. The magazine release is ambidextrous. The ejection port is right side-only.
The rifle has accessory rail above the receiver and below the barrel. Side rails can be installed if desired.
- M17S556: Basic model.
- M17S-C: Canada model.
- M17S300: Chambered in .300 AAC Blackout. Currently in prototype stage.
- M17S65G: Chambered in 6.5 Grendel. In planning stage.
- M17S762: Chambered in 7.62×51 / .308 ammunition.
Models currently in production also have California-legal versions with modifications to follow California regulations.
- ↑ http://www.kmarms.com/M17S556.html
- ↑ http://www.kmaerospace.com/M17S556.shtml
- ↑ https://modernfirearms.net/en/civilian-rifles/u-s-a-civilian-rifles/km-m17s-556-eng/
- ↑ http://www.kmarms.com/M17SCanada.html
- ↑ http://www.kmarms.com/M17S300.html
- ↑ http://www.kmarms.com/M17S65G.html
- ↑ http://www.kmarms.com/M17S308.html