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i have a 1991a1 colt compact model for my next project(after i finish my current project(springfield)). my question is why can't i just remove the extra stuff and put in new hammer,sear and firing pin and whatever else needs to be changed? Ive seen reference to welding up the series 80 holes in the slide, but is there anything that needs to be done to the frame?
i am the original destroy-it-yourselfer.seems like everything i've learned has been because i screwed it up first.(does get expensive)
thanks,
mike
 

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You can do as you suggest with the welding and all but its not necessary. Several guns I deal with have been "De-80ed" by ordering a slot filler for the frame from Brownells. The other parts in the slide can be removed and the hole left open. I have been told that the firing pin and firing pin stop must be replaced with the none 80 parts. This system seems to work just fine, several of the guns I am aware of have several thousand round thru them.

Some peoples thoughts on this is that you are increasing your liability be deactivating a safety device. Sort of like pinning the grip safety.
 

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Just leave the plunger parts out of the slide and laeve the slide alone in case you want to return the slide back to the 80 set up. After the plunger and spring are removed from the slide you can use either the 70 or 80 firing pin and stop. Brownells does sell a spacer for the frame to fill the space voided by removal of the upper lever of the 80 set-up. Use the 70 series sear and hammer. Again retain all the old parts in case you want to go back to the 80 set-up. I did it to a few of my pistols and they work fine I also kept the set-up in my Delta Elite and it works fine with a 4lb trigger.
 
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