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Sorry...don't know about dropping the G17 upper assembly onto a G18C lower assembly...or dropping the G17 lower assembly into the G18C frame.
I had completely stripped and painted the smoked lower to flat black.
I just put a TM G17 clear lower GBB through a decent amount of usage. I ran it a bit in stock format then added a Guarder 150% recoil spring. Just recently I topped it off with a PGC G17 barrel/slide kit (fit perfectly right off). I haven't hammered it hard enough with this barrel/slide setup to see what long term wear will happen.
I had modded the hopup a inner barrel fit to the outer barrel...accuracy is excellent.
Mags were very tight...now they are dropping free a bit more regularly.
Zero wear and tear, zero functional issues...I have not noticed the frame screw hole up front cracking (I'm careful not to torque down hard on it though).
It works/shoots very nicely right now. If I do change anything on it, I will change the hopup rubber to a A+ rubber and the inner to a SS tightbore (although the barrel is pretty short so I'm not sure it's really worth it for a CQB/field gun).
Temps have been cool/mild...so I won't worry about the nozzle until much later. I don't think I'm going to short stroke this...and the trigger is fantastic as is.
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