What's the dummy suppressor for?
I think sometimes it's done for legal reasons (rifles below a certain barrel length in the US are special and need some extra permits, but permanently attaching some kind of muzzle device counts as increasing the barrel length, and using a dummy suppressor specifically can get you the aesthetic of suppressed compact carbines like the AKS-74U or CQBR without the legal hurdles), but in this case it might not be that, since the M1 Carbine already has a sufficiently long barrel. The page I got it from states it might be a movie prop or display item.
My favorite gun to use on the NLF side playing Rising Storm 2. In early war they only get access to WW2 surplus weapons compared to the yanks M16s, I always found the SKS to be a bit too much gun for that game, and preferred switching to the 30 round M1 since it didn't really matter how big the bullet was, getting hits in with a faster fire rate was really effective
It's currently on sale on steam atm for like, 1.50 CAD, btw, so I imagine that's like 1$ USD or something. It's a good time playing as the Viet Minh, less so as the imperialists but at least you get some fun options to play as there, such as the Australians.
Favorite WWII gun.
