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Assembly pin backing out: Easy fix

892 Views 13 Replies 7 Participants Last post by  TxCajun
After having Kel-Tec twice sending me the newest assembly pin, because I've always had a problem with mine backing out (very rarely) and then telling me to replace the spring, I looked it over and decided that the spring I have seems to have plenty of tension, but the pin  has a round radius where the low spot that the spring rests in, meets the high spot and needs to be slightly modified.  I put the pin in a drill that I mounted in a vise and using the edge of a 6 inch flat file, which just filled up the low spot space, lightly squared off the radius.  This was done under a lighted magnifier, but probably wasn't needed.  I cold blued and oiled the pin and now when I put it in and remove it, there is a noticable "snap" to it and I believe that solved the problem.  I did not make the part where the spring rests any smaller in diameter, but would have if needed, but didn't need to do so.
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Way to go! Feels good to do a fix like this don't it?
I picked up a used pre-owned P-3AT that has a similar problem. Finally, I got it under a strong light and noticed the assembly pin hole on the far side was wallowed out enough that the pin was allowed sufficient movement it would work it’s self out. Unfortunately I had to send the P-3AT in to have the frame replaced.

Wilson – who’s hoping you fix cured the problem :)

Your mod works just fine.
Only thing is, don't overdo it!

If you do, it becomes very difficult to get the pin out without pushing the spring out of the way with a dental pick or something.

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What gets me is the pins they sent me, were the latest ones and they still can't get it right. They just needed to cut a little sharper radius. It seems to hold a lot better now, but not enough to be too hard to remove.
  The stock pins are usually fine. I'm with Wilson, and betting that at least one of the holes in the frame is wallowed out.

The pin is a tight fit in both holes.   I bought the gun new and always kept an eye on the pin, watching it after just about every shot. because I'd heard about the problem.  As soon as it poped out a little, I put it back in.  It's only happed twice in about 500 rounds.
Okay! I believe you. I wonder if you got a bad spring?

It seems to be holding a lot better than it did before I modified the pin. I just got back from running 100 rounds through it and no problems.
That noticeable click is a good thing, I've always had that and never had a problem with the pin walking out.
This was more common with the 1st gen guns. The assembly pin was redesigned at least once. People now complain that the 2nd gen pins are harder to remove. I guess this is why. Is yours a 1st or 2nd gen gun? If it is a 2nd gen, I believe this is the first time I have seen this issue in a 2nd gen pistol. Perhaps your spring was sprung. :-/
Mine is a first generation 3AT, and I was aware of all the problems they had before I bought it, but I've been lucky. Of course I did the rampectomy and fluff and buff, so it is very dependable. Now I have the pin problem solved too.
Ah so! Now all is explained. I couldn't believe that a SG gun would have this problem! Be careful, from now on, to hold pressure on the grip side when you remove the pin.

Makes sense (1st gen). I'm glad you found a solution.
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