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Discussion Starter · #1 ·
The 9 round magazine for the Kel Tec P3AT 2nd Generation.

Materials Required:

1 standard P3AT Magazine.

1 North American Arms Magazine with round Extender.
Item # MZ-380_EXT      $30.00 from NAA

3)      Completely dissemble both magazines.  Remove the base of the NAA extension like most magazine bases to allow removal of the spring and the follower.  Removal of the extension from the NAA magazine requires that the back plate come off first.  Fit a small screw driver or something into the hole in the back of the extension and push/pull it down.  The dovetailed piece slides down, then the extension can be removed from the NAA magazine.

4)      Slip the NAA extended base onto the bottom of the KT magazine.
5)      Slip the NAA follower and NAA spring into the now extended KT magazine body.
6)      Assemble the NAA magazine extension onto the KT magazine.

Gently slip the converted magazine into the 3AT.  You will notice that the magazine does not seat well.  The problem is that the KT hammer spring catch (part # 279) does not conform to the top of the NAA extension base.

Simply stuff a rag down the 3AT grip magazine well, and sand down the hammer spring catch.  There is ample material on the catch to still retain the hammer spring pin (part #274).  Use caution at this step to not over do it.  It should be a sand a little, fit…sand a little more, fit type process.  You can use a Dremel sanding drum on it, but remember.. go slow and easy.  It does not take much to get a nice fit.  You could take the hammer spring on and off during this step if you are worried about marking up your grip, but then you run the risk of stretching the hammer spring, not to mention the hassle of taking everything apart many times.

10 rounds can go into the magazine at this point, but to much pressure is on the rounds to pop into the KT magazine catch.  I have not tried it, but it may be possible to clip a loop or two of the NAA magazine spring to allow for round ten.

I went to the range with all of this done.

I only shot one magazine full but no failures of any kind with this set up.

Any questions, comments or tips are welcome.

32,265 Posts
peaceful99 said:
Great idea!!   8)
I can't belive no one has tried to do this before.  
It has been done at least once before, but not this well. 8)


Discussion Starter · #10 ·
peaceful99 said:
... Do you think the KT follower would work in this set up?
I tried that, the KT follower did not fit well with the NAA spring. I actually destroyed the KT follower trying to make it work.

sprinter1 said: about a 30 round mag and a selector switch for single shot, 3 round burst and full auto :eek:
Look for that post the third Monday of next week, I should have the kinks worked out by then!

449 Posts
Nu_Agin_Shooter said:
10 rounds can go into the magazine at this point, but to much pressure is on the rounds to pop into the KT magazine catch. I have not tried it, but it may be possible to clip a loop or two of the NAA magazine spring to allow for round ten.
Are you sure that the spring is stacking up and preventing the mag from seating or could it be the naa follower? Possibly shaving a fraction off the follower legs would allow it to seat.

Discussion Starter · #12 ·
Okay, I know this is an old thread but I was kindly directed to it when the subject came up in another thread. The OP says this is for a 2nd Gen. P3AT. Is there any reason it wouldn't work for a 1st Gen.?

68 Posts
I've enjoyed experimenting with this 10 round mag mod.
I've played with different springs and follower combinations.

The use of the NAA spring didn't work out for me, either,  as it was too stiff.
Currently I'm using the spring out of my 3AT with one round extension mag.

The NAA follower occasionally would bind for me, so I settled on the P-3AT follower.

I could never get more than about three rounds off in a row with out the mag dropping for me, when I had the stock mag catch.

Now that I have a metal mag catch on my P-3AT ... it looks like it will be reliable!
Too early to tell as I only have four complete 10 round mags through it to date, slow & rapid fire.

IMO this modification is definately worth a try  :) ... YMMV as always of course.

Thanks to the Nu_Agin_Shooter!

Discussion Starter · #18 ·
sullied said:
Just got the NAA 10 round. I trust the poster's superior handiness, but was wondering if one might dremel a notch for the protruding spring catch in the contacting flat spot on the NAA mag?

Check the thikness of the spot on the mag before you put the dremel to it.

Consider the cost of blowing a hole in that expensive mag you just bought - vs - the very thick spring catch that would be dang near impossible to grind down to much.
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