A Sig Sauer Mosquito will give you daily lessons in clearing jams, stovepipes and FTFs, if you want it to.
Seriously, this is a great training gun. It is reasonably reliable and accurate, but all you have to do is feed it some golden bullets or some other bulk pack marginal brand, and it misbehaves on cue. However, if you feed it CCI MiniMags or other quality 1250 FPM/40 grain round nosed ammo, and it runs like a champ.
So you get started with a few mags of reliable ammo, and then start mixing in the garbage, so you can get practice with your clearing drills. I always end with a couple of mags of Mini Mags just to end the session on a high note.
Kind of like teeing up a new ball on 18. You don’t want to end badly.
That Sterling was a copy of a Bernardelli. The Bernardelli was a jewel, the Sterling, garbage.