Trim the bottom of the accuwedge, with a razor blade or sharp thin bladed knife, till it's the appropriate size to allow the upper to fit snugly on the lower. Use the trial an error approch by trimming off a little at a time then test fitting till you have the correct size.
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When I've used the Accu-wedge, I've found it takes some brute strength to get the lowers mated enough for me to push the rear TD pin in. Once closed, I have to use a hamme/punch to tap the TD pin out for disassembly. I'm of the opinion that SlickRider is steering you in the right direction here. With some judicious trimming you should be good to go.
Quoted: The upper/lower fit on my carbine is the exact opposite. I have a flattop from CMMG (manufacturer unk) and a Stag lower and the fit is so bloody tight that it requires a flathead screwdriver to pry the rear takedown pin out of it's recess, and the butt of the screwdriver to pound it back in when putting the carbine back together. It has become easier to do the more that I have fired it, but it's still a chore. I really hope that this question doesn't hijack the thread, but I am curious if any of you folks have a remedy for the exact opposite "problem" of the above shooter?
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How old is your upper/lower? Have you excersized them a bit to see if things will settle or has the upper/lower rarely been seperated?
First have you liberally oiled the rear take down pin? If your rear takedown pin just seems like it won't go in the hole, it may be caused by friction between the inside of the takedown hole and rear TD pin. If you have tried that, or it appears that the holes just don't line up properly- I'd recommend you either get used to using tools to seperate the receivers or head to the "trouble shooting" forums here and ask for others w/ actual experience. I'd offer some suggestions, but since I've never personally attempted corrective measures for what you describe, it'd be better to seek a general consensus than one guy's guess in an unrelated post.
If I could also make a suggestion... Don't use a flat screwdriver to pry the rear takedown pin. Use a punch, preferrably polymer, and a hammer to tap out the TD pin. (You might scratch your receiver on the RH side of the frame w/a screw driver but of course if you're not careful, a hammer could do damage as well.
Hope it works out for you.
Sly
Edited for clarification.