Kinda a lazy question... if you have a preferred gun
in mind then it's a little Google leg work to find some
reviews of the available metal kits.
There are a few different companies making alu kits,
in my opinion Guarder cast aluminum ones always
seem to be very poor by comparison to PGC, Prime,
ProWin, Sheriff, Nova etc. Fragile, need moding of
original parts, possible filing of the kit itself and
untapped screw holes. If you go metal, get a quality
CNC'd alu slide, and frame if available.
That being said, sometimes the gun can be become
a gas hog and not preform the way it was in stock
form. It can be frustrating to balance the extra kick,
gas consumption and overall performance. So I know
a few people who have sold off metal kits, to get
back the original crisp play. Those were Guarder kits
taken off TM guns, and returned to stock.
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