In general, for any given caliber,
Pistols with a shorter (lighter) slide in the same caliber need heavier springs to prevent the slide from hitting the back of the gun with enough force to damage the frame.
Pistols with a heavier slide in the same caliber need a lighter spring as there is more impulse energy being absorbed by the mass of the slide.
Look into full size 9mm guns like a Beretta 92, Glock 34, or 9mm 1911.
Really though, it's more about using proper technique then the equipment. If your friend can manipulate a 20lb object then they can manipulate the slide.
Pistols with a shorter (lighter) slide in the same caliber need heavier springs to prevent the slide from hitting the back of the gun with enough force to damage the frame.
Pistols with a heavier slide in the same caliber need a lighter spring as there is more impulse energy being absorbed by the mass of the slide.
Look into full size 9mm guns like a Beretta 92, Glock 34, or 9mm 1911.
Really though, it's more about using proper technique then the equipment. If your friend can manipulate a 20lb object then they can manipulate the slide.

Comment