Guarder "upgrades" for WA and TM are crap.
All the internals I've had the displeasure of
replacing were less durable than the original.
stock parts. I've also seen the fragility of
their crap-cast aluminum kits. Had one of
the TM 1911a1 kits, and the thin areas could
be snapped with your fingers, lots of little
Guarder sells most of the cheapest GBB
"upgrades" you can buy, and they are cheap
for a reason.
Guarder is the WE of the parts world.