The STG-556 is a Steyr AUG A1 clone manufactured by Microtech Small Arms Research (MSAR). It was introduced at the 2007 SHOT Show. The STG-556's working system features a bolt hold-open device as seen on the M16 rifle; otherwise, the STG-556 retains the original AUG features, such as feeding from proprietary polymer plastic magazines and having the quick-change barrel option. The STG-556 rifle can be converted from either having a telescopic sight or a MIL-STD-1913 rail. It is available in civilian (semi-automatic only) and military/law enforcement (select-fire) variants.
A limited edition STG-556, a clone of the Steyr AUG A3, had a production run of only 1,000 rifles. Another limited edition Steyr AUG A3 clone, the STG-556 Gebirgsjäger, had a production run of 500.[1]
MSAR's latest model is the STG-556 XM17-E4. The STG-556 XM17-E4 was introduced at the 2009 SHOT Show. It can use AR-15 and M16 magazines.[2]
The TPD USA AXR revealed at the 2007 SHOT Show, manufactured by Tactical Products Design Inc., is a similar weapon.
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