I'm not sure if it was guessed at before...but your blowback unit frame assembly could be riding hard on the rails of the frame. If it's cockeye'd/tilted it'll rub "hard" and kill off the recoil speed/functioning.
I transplanted all my stuff from a HiCapa into a Silver SD Executive slide...and no matter what....just couldn't get it working right. Ask Illusion...we burned about 2 hrs swapping all types of parts into/out-of it and just couldn't find a combo that worked. Ended up with $400 worth of junk parts...pretty, but functionally useless to me. What a disaster that was.
Factor in the cost of the GBB...cut your losses when you've hit half of that value with either parts or time/frustration/etc...and just buy a new one.
Tys
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