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I was just wondering if anyone knew if it were possible to install a USPfs hammer on a USPc .40?
 

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They are the exact same hammers (all calibers) and are interchangeable between the USP and USPC. Available for $10 from CDNN plus $10 flat rate shipping so order some more stuff.
 

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I ordered one from CDNN 3 weeks ago and it DOES NOT fit into my USP Compact .45... There are two versions of the hammer, early and late, so get the right one for your gun. I have the late style hammer and cannot use the ones that CDNN sell.

my 2 cents
 

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cock the hammer back and look closely at the base of the hammer where the flat part meets the round part (the side where it hits the firing pin) and see if it has a groove milled out of one side, if it does you have the late style, if it is solid, you have the early style.
 
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