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Discussion Starter #1
The picture attached shows how I took care of the mag jingle on my M&P 40. It pushes the rounds close enough together to prevent the spring pressure from being on one side of the stack.



If you thought the 15th round went in hard before, wait till you check it out with 10 thousandths of room missing inside the magazine. It does load ok using a magazine loader.



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Append 1: ------------------------------------------------------------------

This is outstanding! After reading how John's extensions are working with the stock mag spring, I decided to shorten one to see how it works. I cut a magazine spring down by 1 turn. Reinstalled it with a new mag shim. Loaded 15 rounds without the mag loader. (It's tuff) No rattle. Fired several full mags starting with 1 chambered and 15 in the mag. No problems. Mag snaps in the pistol like it should. My main concern with the shortened spring was that the last couple rounds might not feed properly, and the slide would not lock back on last round fired. I fired 50 mags with 2 rounds loaded. Worked perfectly. Now I'm carrying 15 + 1 and two 15 round spare mags with no rattle.



I'm going to get spare springs and floorplates for my annual replacement now. Don't think I'll really need them before next year, but I want to be ready if the springs soften too much.



Apend 2: ----------------------------------------------

I now am selling "Mag Shims" for the 15 round M&P 40 magazines.



facts:

1. They are mostly hand made. If they start selling good I'll be stamping them with a die. = Nicer looking, maybe cheaper.

2. The last round is hard to get in. You will need a good mag loader.

(Shorten the spring like listed in Apend 1 and your good to go, if not, read on.)



Even if you only carry 14 in the mag, you won't rattle when you walk, and there is less pressure

on the magazine floorplate than a standard magazine with 15 rounds loaded. Carry spare mags with 15 each. These have slightly less pressure on the floorplate than a

standard 15 round mag, full, and inserted in the magazine well.

My older mag springs have softened a bit, loads easier, still functions fine, but I still use a mag loader.

(Before posting this I put a new shim in my newest mag. Without the mag loader,

round 14 was really hard to get in, #15 I could not get in until I used the mag loader.)

3. If your mags still rattle, return them and I'll refund your money.

4. I'm going to be selling a mag loader as soon as the patent is done. (It is really sweet.)

5. Weighed one for the IDPA shooters. 59 grain. equals .135 ounce.





Send a check with your order to the following.



Louisa Enterprises

P.O. Box 150

Letts, Iowa 52754



Minimum order 2. Price $7.50 each. This includes shipping and tax.







  • Pic #1 shows shim inserted partially into magazine. Note the notch in the turned up end of the shim. It engages the catch on the floorplate, and is held in place by the magazine floorplate.





    Pic 1

 

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Hey boss, think you could make me some of those?



that is really slick!
 

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Great solution!



If the "jingle" problem is pervasive enough, you may be able to sell enough of these to be rewarded for your effort. Please let the forum members know if you are interested in selling any of these.



-Mike
 

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Discussion Starter #5
mcone said:
Great solution!



If the "jingle" problem is pervasive enough, you may be able to sell enough of these to be rewarded for your effort. Please let the forum members know if you are interested in selling any of these.



-Mike


I'll check materials, and make some up for people that want to give it a try. Have to make some gigs to speed the process up. Probably have some available in a couple weeks. Won't cost much.
 

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If it don't rattle, don't go into battle. I'll let mine jingle, doesn't bother me a bit. I think every S&W I've owned rattled with a full mag. I think some Sigs do it also. I don't put anyone down for trying to fix it but, I figure S&W spent alot of money designing these things and I'm no mechanical engineer so I'm leaving well enough alone.
 

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I have a problem with the "I hear them coming". If I do anything, I get a loud tap tap.
 

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My XD mags are silent - no matter what I do to the gun. I would like the M&P Mec-Gars to be silent too. Looking forward to trying this solution.



-Mike
 

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I'll buy'em if your makin'em! This jingle has got to stop.
 

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I got some to test in the mail. I'll let you know how well they work.
 

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You can purchase CRES shim stock in every thickness you could ever want. Why not try .007 and .004 and see if these solve the problem of the rattle and the hard 15th round insertion.
 

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Discussion Starter #14
MP40Fan said:
You can purchase CRES shim stock in every thickness you could ever want. Why not try .007 and .004 and see if these solve the problem of the rattle and the hard 15th round insertion.


I started out with .005, tried .007, and tried .008, still jingled.

Found my 3 mags differed just slightly. But it took .010 to consistently hold the stack together. The best cure would be for S&W or an after market maker to adjust their dies to make the mags .010 less on the ID.



My shims are holding up so far. Some of the earlier ones I tried with different materials started curling in at the top whish would catch them in the spring and prevent loading to capacity.



We'll see how Jester's work out. Maybe I'll make some up for those of you that want to donate a little to my favorite charity.



Reminder:

Remember to vote against every piece of crap anti gunner that is running for election.
 

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fired 3 mags worth of ammo tonight, seems to be working fine.



one mag jingled with the spacer still in, I slapped it to the rear, no help, slapped it to the front, now its quiet.



More testing this weekend.
 

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Discussion Starter #16
Jester said:
fired 3 mags worth of ammo tonight, seems to be working fine.



one mag jingled with the spacer still in, I slapped it to the rear, no help, slapped it to the front, now its quiet.



More testing this weekend.


Actually that's good, now we know the simpler method won't work with all the mags. I'll send you one of the more complicated ones to put in that mag. I should have sent you one of them with the others in the first place. Hope you marked the mag that is wider.



Last week end I shot 249 out of 250.... qualification course with my M&P.
 

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Discussion Starter #18
Looks like in about 2 weeks I'll be ready and willing to sell shims for the M&P 40 fifteen round magazines to stop the jingling when loaded above 10 rounds. When ready I'll post a notice of how much (cheap) and how to order. I can't say they will correct every mag, but with some dimension changes the design I have settled on looks very promising. It's nice to walk around again with a full magazine.
 
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