>>64167121
>bolt
Aktschually it's the carrier assembly. What does it carry, you might ask? No idea, the firing pin maybe. But the gun doesn't have a true bolt, which is pretty cool.
>>64170239
The LSAT carbine was chambered in a 5.56x45mm -- presumably M855A1 -- equivalent. It's just that 5.56 CT is about as long as a 5.7 or .30 carbine cartridge.