Brought home the AR

I was talking to a friend and he mentioned something about these pins. What exactly are they for? I noticed newer guns do not have these pins.
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That pin was there to placate the powers that be and to discourage those who would attempt to add a safety sear or DIAS to the Colt, it is of little concern to most CDN owners. Your gun has to following exclusive features.

Two screw takedown/front axis pin
Large hammer and trigger pins
Sear block

Despite these features you have an original Colt, don't mess the gun, RRA makes a decent two stage trigger. Leave the gun alone and shoot the crap out of it. Buy another rifle for modification.
 
Those appear to be for a sear block. It should have an insert in the area where one might try to install an auto sear, which would block your attempt to do so.
 
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