SSR15 op mancraft engine (single shot)

My first rifle, converted to HPA years ago, is now sitting idle. Comes with 2x PTS 150 mags. Shoots reasonably well, but only on single shot. The inner barrel has been replaced, it has a Maxx hop-up and I think a Maple Leaf rubber (I don't remember the latter).

I still have a small box somewhere with some small stuff that goes with it. (No F mark)