M&P main spring in a Glock 34...


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CharlesT
April 18, 2011, 11:55 PM
I test fitted it today and it worked. Has anyone thought about doing this?
I see no problems with it.

I like the fact that it is all metal.

Together
http://farm6.static.flickr.com/5103/5632965747_89848c81d0_z.jpg

Glock on top
http://farm6.static.flickr.com/5269/5633549618_61fdf9c9b6_z.jpg

Glock left
http://farm6.static.flickr.com/5189/5632967479_3a9502c3f1_z.jpg

Glock left
http://farm6.static.flickr.com/5182/5632968381_6f9b15a000_z.jpg

Glock spring
http://farm6.static.flickr.com/5264/5633551936_efc38fd8e7_z.jpg

M&P spring
http://farm6.static.flickr.com/5304/5633552502_db2f939800_z.jpg

Glock Spring
http://farm6.static.flickr.com/5187/5633553722_981722e8a9_z.jpg

M&P spring
http://farm6.static.flickr.com/5028/5632970199_a5659d4bde_z.jpg

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Strahley
April 19, 2011, 12:43 AM
Just because it fits doesn't mean the two springs will have identical rates. Stick with the factory one. If it needed to be metal, it would be

NG VI
April 19, 2011, 01:07 AM
If you really want a metal assembly, there are aftermarket Glock-specific setups, even though the M&P is a descendant of the Glock you might as well run something made for it.

CharlesT
April 19, 2011, 01:29 AM
OK.
It just looks worn already and I've only put 600 rounds through it.

Manco
April 19, 2011, 03:30 PM
If you really want a metal assembly, there are aftermarket Glock-specific setups, even though the M&P is a descendant of the Glock you might as well run something made for it.

I agree with your advice, although I wouldn't say that the M&P is a "descendant" of the Glock (unlike the Sigma), as they're rather different internally, even though they're the same type of pistol in many respects. For example, an M&P sear (a separate part) won't fit in a Glock because the Glock's sear is an integral part of the trigger bar. Likewise, a Glock connector won't fit in an M&P because M&Ps don't even have such a part--instead, a ramp on the slide engages the striker block ramp on the trigger bar and directly moves the trigger bar laterally away from the sear, allowing the sear to catch the striker. Their internals (including structural design) are different in virtually every other way, as well (including the fact that the M&P trigger system is really SAO rather than quasi-DAO like the Glock's). Maybe their recoil springs are similar enough to work in either, but that would be the exception as opposed to the rule, and I wouldn't take a chance on interchanging any parts between two pistols that are so different (even the Sigma generally cannot use Glock parts, and it's an outright Glock clone).

ny32182
April 19, 2011, 03:48 PM
I recently bought an M&P (yet to fire a round through it), and in my reading it seems widely accepted that the recoil springs are interchangeable. Not sure about the rods. Since there is stuff branded both ways I don't see any reason not to buy the stuff marked for the gun you plan to put it in.

If you don't have a specific performance based reason to change the Glock rod, I wouldn't... The more aftermarket parts you have, the less reliable the gun will be. I've seen that over and over. You won't break the Glock rod, not in 600, or 6000, or likely many more rounds than that.

Whiskey11
April 19, 2011, 04:44 PM
NY32182, you should tell that to the gentleman who ran 1000 rounds through his Glock and had his spring guide shatter.

http://www.youtube.com/watch?v=0_JuF23qazI

It breaks in part 2 of the video at about the 800 round number. Extreme, yes, but the idea that you will never break it, is false :P It can happen, and in this case, did.

ForumSurfer
April 19, 2011, 04:59 PM
NY32182, you should tell that to the gentleman who ran 1000 rounds through his Glock and had his spring guide shatter.


Stuff happens. :)

I'm on 2500+ rounds with no issues. I'm even past due on the recommended recoil spring replacement I believe.

If it bothers you that bad, buy a metal replacement along with a replacement recoil spring that you will need one day. Keep it on hand for when it breaks.

If I need to buy one, I'll buy one meant for the glock and the specific spring rates. Why run out and buy one for an m&p if I need to buy it anyway?

ny32182
April 19, 2011, 05:01 PM
Someone will always manage to break a part here and there in a shorter timeframe than they should. I broke a mag catch spring at ~4400 rounds; I doubt many people have accomplished that. That doesn't mean that going out to get aftermarket parts is a good idea. I won't claim to be an expert, but I see a lot of Glocks at matches, several times a month, and if they are malfunctioning, one of two (or both) factors is at play: bad ammo, or aftermarket parts. This has led me to really evaluate whether I need any specific aftermarket part. I have a few, but they are all meant to accomplish a very specific task, and I keep an eye on them.

My own G19 rod has 4200+ rounds; no breakage yet.:D

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