hey carl, once when i installed the FR, the recoil of the slide decreased considerably. So much so that the slide was not coming far enough back to load the next BB.
It's the same symptoms that are shown when the o-ring from the blowback chamber (part no.88) shrinks and isn't as airtight, so there isn't enough gas pressure for blowback.
does that make sense? and if it does make sense, do you have any solutions or ideas to remedy this?