The carbine is not buffered, as such. The operating spring serves as the buffer. I think it could depend on what you shoot. Marginal or weak ammo may not cycle using a stronger spring, which results in the jamming. A spring too weak allows the slide to bash the face of the receiver and you can see that damage. It has to be balanced and the designers figured all that out specifying a spring that worked with the ammunition designed for it.
The carbine will function across a fairly broad range of pressures. Ammo too strong will beat it up, too weak and it won’t cycle. A stronger spring slows down the action and positively strips a round and locks the bolt, but too strong and it won’t cock the hammer or allow the bolt to retract enough to pick-up the next round. If I intended to shoot known strong loads, I might opt for a “high-power” spring.Information
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