The Vulcan V18 is a

semi-automatic rifle A semi-automatic rifle is a type of rifle that fires a single round each time the Trigger (firearms), trigger is pulled while automatically loading the next Cartridge (firearms), cartridge. These rifles were developed Pre-World War II, and w ...

based on the ArmaLite AR-180, chambered in 5.56×45mm NATO. It was built using a modified carbon fiber AR-15 lower receiver coupled with a modified AR-180 upper receiver formed from heat treated SAE 4130 steel. Standard features of the rifle include an A2-style flash hider, 20” chrome lined barrel with a 1-7” twist, FAL-style hand guard, and polymer side-folding stock. Additionally, it utilizes

STANAG magazine A STANAG magazine or NATO magazine is a type of detachable firearm magazine proposed by NATO in October 1980. Shortly after NATO's acceptance of the 5.56×45mm NATO rifle cartridge, Draft Standardization Agreement ( STANAG) 4179 was proposed i ...

s.Vulcan Group - V18 Rifles
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References

5.56×45mm NATO semi-automatic rifles Semi-automatic rifles of the United States {{Rifle-stub