Here is a great new design magazine for the PP750
8 shots in 22 cal, and nice and small, so no high rings needed. No need to stick the first pellet in from the back like the stock mag, these you load all from the front and wind as you go, no winding it up first before adding the pellets. Works great, loads smooth.
Tip: If using smaller head pellets load it so it is not facing completely down so your pellets don’t want to fall through.