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A lighter slide would have difficulties, unless you used a stronger recoil spring, or a weaker magazine spring.
A quick look at the .22 conversion units will bear this out, as the slides are aluminum, and the magazine spring relatively weak. This is because the .22 doesn't generate as much force, so a stronger recoil spring wouldn't be needed.
Conversely, if you went from a 9mm to say a .357 Sig, which generates more force, you would need to use a stronger recoil spring, and depending on how much stronger the recoil spring would need to be, could also determine if a stronger magazine spring may be necessary.
If you are familiar with Wolff Gunsprings website, they don't recommend their 10% extra power magazine springs, unless you are using a stronger than factory rated recoil spring.
Your question about military use... when you go back to early "submachine guns" of "simple blowback design", either the bolts were so heavy, it made it difficult to hold steady sighting because of the reciprocating mass, or they required extra strong springs.
That's why you only see "blowback operated" firearms of low pressure ammunition, such as .22 S,L,LR, and .25 ACP through .380 ACP.
A quick look at the .22 conversion units will bear this out, as the slides are aluminum, and the magazine spring relatively weak. This is because the .22 doesn't generate as much force, so a stronger recoil spring wouldn't be needed.
Conversely, if you went from a 9mm to say a .357 Sig, which generates more force, you would need to use a stronger recoil spring, and depending on how much stronger the recoil spring would need to be, could also determine if a stronger magazine spring may be necessary.
If you are familiar with Wolff Gunsprings website, they don't recommend their 10% extra power magazine springs, unless you are using a stronger than factory rated recoil spring.
Your question about military use... when you go back to early "submachine guns" of "simple blowback design", either the bolts were so heavy, it made it difficult to hold steady sighting because of the reciprocating mass, or they required extra strong springs.
That's why you only see "blowback operated" firearms of low pressure ammunition, such as .22 S,L,LR, and .25 ACP through .380 ACP.