8 shots in 22 cal, and nice and small, so medium rings work, but they will interfere with the front sights, so you’ll need to add a red dot or scope. 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.
Tip: If using smaller head pellets load it so it is not facing completely down so your pellets don’t want to fall through.