Love these rifles, had one for a couple of years and put a lot of shots through it without any problems at all - very accurate and quiet.
I am quite sure the mags are interchangable with the Sniper range of which I also own one.
I ditched the origonal mags as they were not fool proof when used and ofter mis fed pellets - try Punmatic Balistics for a better option, Iv'e had zero problems with these, I also think you may have issues loading
with a single shot tray due to the breach / barrel space.
Regards - Nige.