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Replacing mag catch spring

This is a discussion on Replacing mag catch spring within the MP Gunsmithing forums, part of the Smith & Wesson MP Forum category; I have noticed a LOT of traffic here about the above. The How-To should be a sticky...


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Old March 5th, 2008, 03:36 PM   #91
 
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mag catch spring - why not a sticky?

I have noticed a LOT of traffic here about the above. The How-To should be a sticky
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Old March 5th, 2008, 04:44 PM   #92
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Cajun... I installed the K&S Engineering 7131 material in my gun and it has worked very well. It is marked "stainless steel" on the packaging. Good stuff.
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Old March 5th, 2008, 04:51 PM   #93
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Quote:
Originally Posted by Cajon Man
Quote:
"Music wire is the best-quality, most generally used cold-drawn high-carbon spring steel. It has a high tensile strength, high elastic limit, and can withstand high stresses under repeated loadings. This type of wire is also called "piano wire", because of it's use in stringed instruments, especially the piano."
That is what I have. Would that be better then using stainless?
Both music wire and stainless are used in the design and manufacture of springs. Music wire has a higher elastic limit than the few types of stainless I've used, including 302 stainless. The spring in my M&P40 is magnetic so it could be martensitic stainless (uncommon) or music wire. It does not have the chrome appearance of stainless so it probably is not. It also has a spot of rust on the top which also leads me to believe it is not stainless.



Being a non-visible non-wearing part the designers probably used music wire, plus it costs less than half as much. You could always try it and compare notes with the others who chose stainless then share the results with the rest of us.
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Old March 5th, 2008, 06:08 PM   #94
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FWIW, stainless alloy 17-7 is the stuff used for many high performance (read tough) antenna designs. It is claimed to be so resistant to bending that it could be bent 180 deg (a section long enough to bend, not kink no doubt!) with no noticeable deformation. I once tried to trim tune a 1/16 in dia, 10 inch stub of this stuff by cutting it with a pair of heavy duty Klien linemans pliers. It still has the dents in the cutters from that. I finally got the job done by filing a nick into it and bending it till it broke off. That was not easy either.



Through the years, the antenna tip hit and dragged against many a parking garage's concrete ceiling. The ball tip took a bit of wear, but the 1/16 in by 10 in length was still straight and true. It never rusted either (Chicago city winters) and had tons of water and salt exposure. Tough stuff if you can get some. Probably overkill as a mag catch spring.
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Old March 5th, 2008, 07:09 PM   #95
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Duplicate post
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Old March 5th, 2008, 07:20 PM   #96
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Quote:
Originally Posted by FrMurphy
stainless alloy 17-7 is the stuff used for many high performance (read tough) antenna designs.
That's 17% chromium and 7% nickel, 18/10 is about as good as it gets.



Quote:
I once tried to trim tune a 1/16 in dia, 10 inch stub of this stuff by cutting it with a pair of heavy duty Klien linemans pliers. It still has the dents in the cutters from that.


17/7 is much harder than the copper or aluminum that steel lineman's pliers are designed for. Try an abrasive wheel. Carbide works great for both, it can get pricey and it'll put your eye out if it chips.
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Old March 5th, 2008, 07:29 PM   #97
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Re: I wish youse guys did stickys Mag catch spring

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Originally Posted by berkbw
The complaint was that the dustcover REALLY hung down a lot.
That's normal.
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Old March 12th, 2008, 09:14 PM   #98
 
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Thanks Optimus,



This mod is worth doing .

I've never had any mag drop issues but allways felt the mag drop button was light .

The .062 music wire you suggest makes it perfect .

After over 2K problem free rounds this is the only thing I'd consider changing on this pistol .

Well, maybe a laser grip for the 9c would be nice .



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Old May 13th, 2008, 06:01 PM   #99
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Has anyone been able to find this at Lowe's, Homey Depo, or Chinamart (my only choices, unfortunatley)? I have gone in the store and asked the clerks but I just get the same stupid "it's not my department" look
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Old May 13th, 2008, 06:18 PM   #100
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Quote:
Originally Posted by fireroad' post='138182' date='May 13 2008, 09:01 PM
Has anyone been able to find this at Lowe's, Homey Depo, or Chinamart (my only choices, unfortunatley)? I have gone in the store and asked the clerks but I just get the same stupid "it's not my department" look


fireload if I remember correctly of what I have read here by other members is that they purchased some rods from Ace Hardware. Maybe try and do a search here and see if you can find the thread. Good Luck!

Edit: Post # 28 in this thread stated Ace Hardware
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Old May 13th, 2008, 06:31 PM   #101
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Ah, if only there was an Ace Hardware in town. If I can't find it in a local hobby shop, maybe somone will take pity on me and send some of their extra....
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Old May 13th, 2008, 07:04 PM   #102
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fireroad...If you haven't already read back through the thread. If I remember correctly one of the members had some left and offered it to anyone who needed it. Either that or you can get the type of material they used and you may find it locally
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Old September 22nd, 2016, 09:23 PM   #103
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1358 rounds and the gun still runs fine. The stiffer spring rod was the perfect fix. Thank you, optimus! Some of the old gang aren't alive or around here anymore, but I'm sure they would be pleased.

Seems like this place has become a sleepy quiet town. Are most people over at the S-W forum?

And an update. I just bought a new M&P40C. I'm looking forward to seeing what S&W have changed on this in the last 8 years.

Last edited by DHart; September 22nd, 2016 at 09:31 PM.
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Old October 8th, 2016, 09:15 AM   #104
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I appreciate the update, if I had read about this answer before, I had forgotten it. Being a lefty who has shot for years with a right handed mag catch, I have learned to check my gun often to make sure the mag was not popped accidentally. It hasn't been a problem but once or twice until I started carrying the M&P. For me, little things like good holster design can mostly solve the issue (scratch Blade Tech 2x) but the idea of more resistance in the mag release appeals to me, and I think I can do this mod and not be concerned about damage instead of improvemen.
ETA-may get a replacement (as in newer) mag catch button first, just to see. My guns are around 2008/09 vintage.

Last edited by Jhp147; October 8th, 2016 at 09:35 AM.
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Old October 8th, 2016, 08:16 PM   #105
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Quote:
Originally Posted by sheepdog View Post
I appreciate the update, if I had read about this answer before, I had forgotten it. Being a lefty who has shot for years with a right handed mag catch, I have learned to check my gun often to make sure the mag was not popped accidentally. It hasn't been a problem but once or twice until I started carrying the M&P. For me, little things like good holster design can mostly solve the issue (scratch Blade Tech 2x) but the idea of more resistance in the mag release appeals to me, and I think I can do this mod and not be concerned about damage instead of improvemen.
ETA-may get a replacement (as in newer) mag catch button first, just to see. My guns are around 2008/09 vintage.
sheepdog... on a 2008/2009 vintage M&P Compact, it wouldn't hurt at all to go with a stiffer spring rod for the mag catch, if you've had even one or two of these events occur. It's so easy to do and just gives an extra resistance to inadvertent mag drops. On my 2007 M&P40C, no inadvertent mag drops have occurred since installing the stronger spring rod. Great little forty launcher!



On my new M&P40C, I haven't experienced any inadvertent mag drops.
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