The new ROCK ISLAND XT .22 is made of 4140 steel, not to be compared to Zamak guns which is what we used to call pot metal.
Nowadays zinc is considered "Gun metal" by dishonest manufacturers. 
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CNC produced 416 stainless triggers to replace the plastic triggers on Colt Mustangs, Mustang Plus II's, MK IV Government .380's and Sig P238's and P938's. Plus Colt Mustang hardened 416 guide rods, and Llama .32 and .380 recoil spring buttons, checkered nicely and blued.
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