Yes.

Kinda

I did not know it was this weapon in specific but I did know it was based on a WW2 era weapon.

DLT-19= MG34

Valken-38x = MG42

RT-97C= MG15

CA-88= Sawed Off Lee Enfield (I think)

T-21= Lewis Gun

A280C= STG44

A180= Luger Pistol

They actually used that real gun as a prop for many of the E-11 blasters in A New Hope, essentially what we see on screen are expired guns