I just acquired a TNW ASR carbine in 9mm. Also made in .40, .45 ACP, .357 Sig and 10mm. Comes apart for backpacking. Calibre conversions available.
Think of a semi-auto STEN gun firing from a closed bolt and you get the picture. Uses Glock magazines.
I mounted a red dot and it is a great grouper at 15m-25m and 100m with American Eagle 124 gr. NO FTF or FTE. People shooting 115 gr report FTF and FTE issues.
Due to the stiff recoil spring, it requires a good load.
I put on a SOG rubber butt pad and suffered three FTE in a session which I attribute to the pad and my winter jacket softening the recoil impulse too much.
Next time I remove the pad and prove it one way or the other.