F21 "Austeyr II" Assault Rifle (Steyr STG.20 Assault rifle)
Origin: Austria (licence production in Australia)
Weight: 3.8 kg (standard)
Length: 780 mm (standard)
Barrel Length: 541mm (standard)
Cartridge: 6.8mm CT(Cased-telescoped) NATO
Action: Gas Operated, Vertical sliding chamber.
Following the completion of the LSAT program and the NATO future rifle cartridge competition, a 6.8mm variant of the cased-telecoped round developed in the lSAT program was selected as NATO's future standard rifle round. Following this several new weapons were developed by numerous arms manufactures to take advantage of the new cartridge. For the developers at Steyr Mannlicher, this meant dusting off the old plans for Steyr's ACR design from the late eighters and adapting it for the new cartridge. as a result, the new Steyr ACR6.8 (known as the STG.20 in austrian service) was one of the first new rifles to be developed.
Its first foreign customer was Australia. the Australian Defence Force saw replacing their old AUG rifles with a design that was so similar would ease issues of retraining. with the added positive of the ACR6.8 being the most mature of the designs available, it was adopted as the F21 Austeyr II, with licenced production being undertaken at the New Lithgow Armements Factory.
Re-equiping the ADF with the new weapons began with the 1st Battalion, RAR, and was scheduled to take two years to re-equip the whole force. however, during the Federal Government Disolution crisis that occured following Australia becoming a Republic (know more popularliy as the "sixty days of pain"), the Military rushed the procurment, re-equiping the Whole ADF at the same time. as a result, the Austeyr II had completely replaced the AUG in Australian service within the year.
The Austeyr II is a minimally modified variant of the ACR6.8 produced under licence in Australia. their are several variants produced. including a standard length assault rifle, a compact carbine, and a long Barrelled designated markman variant. all variants feature full NATO powered rails (with battery in the grip) and are compatiable with STANG double stack and quad stack magazines.
Shown above are three differnt variants:
- A "standard" rifle with a 541mm barrel, the primary variant used by the ADF
- A compact "carbine", here with a 541mm barrel, although shorter barrels are avalible. The carbine is intended for use by vehicle crews and special forces. this example has been fitted with a long lower rail, for mounting underbarrel grenade launchers.
- A Grenadiers set up, with an underbarrel MSIA three-shot 40mm stacked projectile grenade launcher, and an MSIA digital grenade sight with intergrated red dot sight.