It is a well known problem with 10mm Tanfoglio pistols because the factory recoil spring is too weak for the caliber.
This may sound abrasive, and it's not meant that way -- but how do you (or does anyone) know that the 10mm guns are under-sprung?
The guide rod causes the recoil spring to be pressed against the frame regardless of the force of the round, and that position on the frame is pretty stout. Much of the force of the round is transferred to the slide and stored in the spring, but some of it is handled by the hammer spring, as the slide goes back. Anything not stored in those springs goes into you -- as felt recoil. But even a heavier recoil spring uses YOU as the base (solid point) against which the spring is charged. It's not really all that hard on the gun. The gun doesn't really know the difference.
But, if you install a heavier recoil spring, the slide slams FORWARD after the shot with much greater force than it would do with weaker springs , and only the slide stop and frame deal with that extra. A heavier hammer spring added to the stock recoil spring might have the same effect (in changing the shooter's experience of
FELT RECOIL) and not be as hard on the gun as the slide moves forward to finish the shooting cycle.
I've heard of folks firing guns with the recoil springs removed -- 1911Tuner who participates here willl do it with a .45 -- and the force is apparently not all that different than firing a sprung gun. That's because the recoil spring's main function isn't to CONTROL RECOIL but to store force that is used to CLOSE THE ACTION (while loading the next round).
Heavier recoil springs may be causing as many problems as they resolve -- unless spent brass can't be found.
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