STEYR STM 556

Combining the best of 2 worlds, the STEYR STM 556 is a standard assault rifle designed by STEYR ARMS and based on the M4/M16 platform with features of the for decades field proven STEYR AUG.

Thanks to it’s adjustable short stroke piston system it is a very reliable and easy to maintain assault rifle. The monolithic upper receiver with the long Picatinnyrail gives the STM 556 extreme stability and strength to the system and the quick interchangeable barrel, as well as the ambidextrous operation (Safety, magazine and bolt release, …) ensure maximum versatility

A dry lubrification system guarantees reliable operation in all climatic conditions – from the coldest places on earth to dusty and sandy desert areas.

Specifications

STEYR STM 556
caliber
5.56×45 NATO
overall-length
buttstock extended:
With 293 mm / 11,5“ barrel: 830mm / 32.5″
With 356 mm / 14“ barrel: 886mm / 34.9″
With 370 mm / 14,5“ barrel: 900mm / 35.4″
With 417 mm / 16” barrel: 960mm / 37.8”
With 455 mm / 18“ barrel: 1010mm / 39.8″
With 508 mm / 20“ barrel: 1050mm / 41,3″
buttstock closed:
With 293 mm / 11,5“ barrel: 730mm / 28.7″
With 356 mm / 14“ barrel: 786mm / 31″
With 370 mm / 14,5“ barrel: 800mm / 31.4″
With 417 mm / 16” barrel: 860mm / 33.9”
With 455 mm / 18“ barrel: 910mm / 35.8″
With 508 mm / 20“ barrel: 950mm / 37.4″
barrel-length
293 mm / 11,5“
356 mm / 14“
370 mm / 14,5“
417 mm / 16”
455 mm / 18“
508 mm / 20″
weight
With 293 mm / 11,5“ barrel: 3,4kg / 7.4 lb.
With 356 mm / 14“ barrel: 3,5kg / 7.7 lb.
With 370 mm / 14,5“ barrel: 3,6kg / 7.9 lb.
With 417 mm / 16” barrel: 3,7kg / 8.15 lb.
With 455 mm / 18“ barrel: 3,8 kg / 8.35 lb.
With 508 mm / 20“ barrel: 3,9 kg / 8.6 lb.
magazine
Detachable, synthetic (transparent), staggered box type M4 compatible NATO standard
magazine-capacity
30
trigger
Steel hammer trigger mechanism, fires semi- automatic and full-automatic
safety
3 position ambidextrous safety and fire control selector lever (semi-and full-automatic).
stock
retractable, 100 mm, 6 positions