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I have only got three 25acp pistols.
But all three have blow back extraction.
Other than that, they are just blow back semi autos.
There is a relationship between the recoil spring and the load:
a) If the load is too wimpy for the spring, the gun jams. [The slides does not move far enough back and the empty gets stuck sideways or is still in the chamber]
b) If the load is too hot for the spring, the cases fly more than 5' and the slide slams the frame.
If I use triple loads of powder in a 25acp, like 6 gr Power Pistol 50 gr FMJ, I reach the threshold of the primer pocket growing, and the case fails to extract, as it is still stuck to the chamber walls. This is what happens in my two expensive 25acps. My cheap one cannot go that high in a work up, because the primer pierces, due to a poor firing pin to firing pin hole fit.
Things work better with stiffer recoil springs, if the next round is not being pushed hard enough into the chamber. Sometimes people 'fluff and buff' the slide to frame fit, to reduce friction.
Sometimes I load up dummy round and jack them through the pistol in slow motion, while I look to see 'where is the hang up?'
