I have the apex fss trigger kit on my 40 and it's amazing!!! It is pretty easy to install yourself if our rear sight isn't in real tight otherwise you will want a sight pusher. I left the stock trigger return spring in and the stock sear spring in and polished up all the contact points and the firing pin block for a 3.1 lb trigger that's butter smooth. Wouldn't recommend for carry though cause the trigger is so light and there is almost no take up and no overtravel on the trigger.
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