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People would argue that considering any given pistol can run ammo ranging from standard up to hot +p that the recoil spring should be just fine. Also the 96 apparently uses the same recoil spring as the 92. Thoughts?
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OEM springs are designed to be able to function with loads ranging from lighter target loads to +P loads. Engineering common sense would tell *me* that making a spring light enough to use with a light load isn't one *I* would want in MY guns. I simply cannot afford to replace a gun should it shoot itself to death. My 92's all have the older locking block, so it's even more critical for me to keep a proper recoil spring in there.
My opinion on swapping up 2-3lbs on a recoil spring is especially pertinent when dropping the mainspring down to the DAO. This reduces the resistance to the slide when cycling via lesser energy to cock the hammer. One is robbing Peter, so they damn well need to pay Paul, IMO. Would it work otherwise by not changing the recoil spring? No doubt, as many don't change them. But with such a fine specimen as a Beretta, aren't they worth the $9 or so a new recoil spring costs?
As for the .40 spring being the same, I again don't see how that would not beat the slide to death. The chamber pressure of the .40 is clearly much higher than a standard 9mm load, so it goes to follow the recoil energy will also be higher. Again, why take the chance on such a fine gun?