The STG-556 is a Steyr AUG clone formerly manufactured by Microtech Small Arms Research (MSAR).[5] It was available in civilian and military/law enforcement (select-fire) variants.[6]
| STG-556 | |
|---|---|
| Type | Assault rifle/Semi-automatic rifle |
| Place of origin | United States |
| Production history | |
| Designer | Steyr Arms |
| Manufacturer | Microtech Small Arms Research |
| Produced | 2007-15 |
| No. built |
|
| Variants | See Variants |
| Specifications | |
| Mass |
|
| Length |
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| Barrel length |
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| Cartridge | |
| Action | Gas-operated, rotating bolt, short piston drive |
| Feed system |
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| Sights |
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| References | [1][2][3][4] |
History
editIt was introduced at the 2007 SHOT Show. The first few STG-556 rifles were chambered in .223 Caliber.[4]
In July 2012, MSAR resurfaced with a new STG-556 rifle variant known as the STG-E4.[7]
MSAR closed down permanently on March 20, 2015.[8] No specific reasons were stated on their website, but it is well known that Steyr setting up a US based manufacturing arm, producing genuine Steyr AUG firearms, all but eliminated the need for anyone to buy a clone.[5]
Design
editThe STG-556's design was based on the original Steyr AUG since the patents expired at the time.[6] The frame was made on 7075 T6 aircraft-grade aluminum[9] and made from cast, unlike the TPD AXR as it was made through forging.[10] It was available in black, tan and green finish.[9]
It features a bolt release as seen on the M16 rifle[6] and a forward assist.[9] Otherwise, the STG-556 retains the features similar to the Steyr AUG, such as having the quick-change barrel option and the ability to change which side the weapon ejects from by changing the bolt out for a right or left side bolt respectively. The STG-556 has a right-side ejector.
When using a suppressor or low-pressure ammo, the gas regulator needs to be adjusted to allow more gas to be used to fire ammo.[11] The gas regulator positions consist of "S", which is the normal setting and allows large amounts of gas to escape from the rifle.[12] "H" diverts more gas into the rifle to allow the STG-556 to be fired in adverse conditions or extreme foulings.[12] "GR" diverts gas into the system to fire blanks in order to launch rifle grenades.[12]
The STG-556 uses a short-stroke gas piston. The rifle can be converted from either having a telescopic sight or a MIL-STD-1913 rail.[6] Various accessories can be attached on the rail.[13]
The STG-556 uses magazines similar to those used by the Steyr AUG (10/20/30/42),[14] being made up of “radel” (polyphenylsulfone).[11] The rifles can also take 30-round STANAG and Magpul PMAG magazines.[10] The XM-17E4 variant can use STANAG magazines.
Most STG-556 rifles made in 2009 did not allow to use AUG-type magazines unless the three ribs on top were professionally filed off.[12] All STG-556s without a forward-assist mechanism can take AUG magazines.[12]
The barrel can accept a blank adapter or a suppressor.[15]
Variants
editSTG-556 Limited Edition
editA limited edition STG-556, a clone of the Steyr AUG A3, had a production run of only 1,000 rifles. There was a limited production of 232 rifles produced with an 18.5" heavy barrel after tests proved that length provided optimum accuracy over the 24" length due to barrel harmonics.
STG-556 Gebirgsjäger
editThe STG-556 Gebirgsjäger had a production run of 500 rifles. It was named after the Gebirgsjäger, which means Mountain Huntsmen.[16] It was previously sold with an OD green Currahee Knife and a MSAR Pelican 1700 case.[16]
STG-556 E4
editThe STG-556 E4 was introduced in 2009.[12] It can use AR-15 and M16 magazines.[4] For any E4s that use .300 AAC Blackout, they can use the 18.5" barrel.[17]
References
edit- ^ "Microtech Small Arms Research - STG-556 Sporting Rifle". www.msarinc.com. Archived from the original on 10 February 2010. Retrieved 30 June 2022.
- ^ "Archived copy" (PDF). www.msarinc.com. Archived from the original (PDF) on 9 December 2008. Retrieved 30 June 2022.
{{cite web}}: CS1 maint: archived copy as title (link) - ^ "Msar | STG-556". msarinc.com. Archived from the original on 6 February 2011. Retrieved 30 June 2022.
- ^ a b c Choat, Chris (March 2008). "Microtech's STG-556 An Exclusive First Look". The Small Arms Review. 11 (6): 43–50.
- ^ a b "MSAR STG-556: Bullpup You'll Recognize". Archived from the original on 2023-05-09.
- ^ a b c d "MSAR STG-556 rifle". 27 October 2010.
- ^ "Microtech Small Arms Research (MSAR) STG-E4 Rifle". 23 July 2012.
- ^ "Microtech Small Arms Research Closes Its Doors -". 23 March 2015.
- ^ a b c "Microtech STG-556". 23 September 2010.
- ^ a b "MSAR STG-556 Bullpup Rifle (4179 STANAG) and Translucent Polymer AR Magazine".
- ^ a b "MSAR STG-556 Gebirgsjäger". 14 September 2009.
- ^ a b c d e f "STG-556: American Combat Bullpup: If you missed the chance to buy an AUG back in the '80s, here's your chance to buy a U.S.-made version with some interesting improvements. - Free Online Library".
- ^ "Msar STG-556". May 2008.
- ^ "MSAR Magazines – Civilian Tactical Weapons".
- ^ "MICROTEch's STG-556 AN EXCLUSIVE FIRST LOOK - Small Arms Review". 5 March 2008.
- ^ a b "Microtech Small Arms Research - Home". msarinc.com. Archived from the original on 10 February 2009. Retrieved 30 June 2022.
- ^ "MSAR Returns with New STG-E4 AUG-Style Rifles".