DPM Systems Recoil Spring

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ATF

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Ordered a spring set for my M&P Pro 9mm and my Sig P226 West German DA/SA.

I have to tell you that these springs completely transformed my M&P. Previously the Sig was more accurate at long range but the M&P was always my go to gun.

Now the M&P completely out shoots the Sig. I am really amazed by what these springs can do to the M&P. My M&P has the full Apex kit but it was never like this.

The difference is not so noticeable on the Sig. Maybe these springs work better with polymer frames?

https://dpmsystems.com/en/products/product-categories/item/101-mechanical-recoil-reduction-system
 
What is the most noticeable difference?
Does it simply reduce the felt recoil? Does it reduce the upwards movement? Any problem with ejecting spent cases?
 
Johnmuratore said:
What is the most noticeable difference?
Does it simply reduce the felt recoil? Does it reduce the upwards movement? Any problem with ejecting spent cases?
Click to expand...

I found I was shooting low before and shots out to 50m were just not happening. Yes the recoil and upward movement is decreased significantly and the kit comes with two springs. One for hot ammo and one for normal.
Only thing I noticed on ejection was sometime the casings would fly over my head.
As I said a big difference to the M&P. Sig not so much but I'm still tweaking the Sig.
 
Here is the US source, and on sale too. I put one on my M&P 40 Pro (Limited) gun, and it makes a difference. However, after around 5,000 rounds, the spring rod deforms a little, and needs sanding at the ridge. I've tried the SSS tungsten, with a variety of spring weights, and this still beats it.

DPM Smith & Wesson
 
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how did you get the thing to work?

ATF, I too bought the dpm system after reading a bunch of positive reviews. But I can't get my M&P 40c to function reliably with it installed. Basically I can fire one or two shots and then I get a misfeed. I've tried both springs and a variety of different types of ammunition. Any tips would be appreciated. I'm on the verge of trying to return the darn thing....
 
it amazes me how much snake oil is being sold these days....dropping $70 to help mitigate recoil on a 9 mm? wow.....just wow!
 
um83canes said:
ATF, I too bought the dpm system after reading a bunch of positive reviews. But I can't get my M&P 40c to function reliably with it installed. Basically I can fire one or two shots and then I get a misfeed. I've tried both springs and a variety of different types of ammunition. Any tips would be appreciated. I'm on the verge of trying to return the darn thing....
Click to expand...

I really don't know I have a M&P 9mm 4.25" barrel Pro Series and it works really well. I have no experience with the Compact.
Is your M&P new? Mine used to have some misfeeds before I broke it in.
 
thecatch8 said:
it amazes me how much snake oil is being sold these days....dropping $70 to help mitigate recoil on a 9 mm? wow.....just wow!
Click to expand...

I agree with you. This difference on my Sig is negligible or non-existent even but on the M&P 9mm it gives much better accuracy. It doesn't just mitigate the recoil. I can honestly say it has transformed the M&P but everyone's experience may not be the same.
 
Rastoff said:
I have a hard time believing that a recoil spring will improve accuracy. Maybe it will help with a follow up shot, but accuracy?

Still, I think $86 of ammo is better for improving accuracy than a spring.
Click to expand...

I know it may seem as a bit of hocus pocus and the only logical answers I have would be that the M&P is polymer so the frame flexes under recoil. Also the Sig came with a match fit barrel. Absolutely no play between the barrel and slide whereas the M&P has quite a bit of play between barrel and slide.

I've put about 5000 rounds through the M&P so it's not my imagination or bad habits.

Seems like these springs work well in some guns but not in others.
 
I've experimented with using heavier weight recoil springs in my Ruger 9mm, to see if it would eliminate the slide bottoming on the stopping block and reduce flip. Stock springs were 16 pounders and I tried 18, 20 and 22 pound springs. I got jams and FTL's occurred with the 22 pound springs. I really could not notice any perceptible difference in the recoil between the stock and 20 pound springs. I did not count the 22 pounders as the gun would not function with them, one shot and a problem. The end result was $25 wasted on springs, and I ended up re-using the stock recoil springs. Part of my test was to try to reduce flip to near zero, but as stated, I could not feel any difference in flip/recoil, even though there had to be some improvement. I am a Mechanical Engineer and know that stronger recoil springs should have made a difference, but the only thing I noticed was the slide was more difficult to rack back. S&W chooses springs to operate under varying conditions and ammunition power levels. They use middle of the road spring weights that will work under most all variables. Not too soft to cause ejection and excess impact issues, and not too strong to cause ejection/feeding issues along with overly difficult slide racking.

Bob
 
Last edited:
ATF said:
Off hand. I have never clamped the pistol, so I see where you are coming from.
Click to expand...
It doesn't need to be clamped, but if it's not at least on a rest, any judgment of accuracy is anecdotal. There's just too much room for error on the shooter's part.
 
Rastoff said:
It doesn't need to be clamped, but if it's not at least on a rest, any judgment of accuracy is anecdotal. There's just too much room for error on the shooter's part.
Click to expand...

Yes you are completely correct, that's the only way to get a proper scientific result. Should have done that.
 
I've been watching this thread since it started because I bought a Sprinco recoil reduction spring assembly a while back but never got around to trying it. So, to add to the confusion (:eek:) I just installed it today and am going to try it out at a match tonight. I'll post after the match and tell you what my impressions are. I don't know how different the Sprinco is from the DPM system but I suspect they are similar in approach. Here are some pictures of the install.

Obvious difference from stock is that it is a non captured main spring.
i-vHpnbS7.jpg


The guide rod is a multiple part piece with at least one internal spring.
i-WwBT2N9.jpg


Installing the spring/guide rod is certainly more "fussy" than the stock captured spring assembly.
i-5vjsGzk.jpg


Initial impressions, racking the slide feels different, the initial movement is easier, the mid range feels about the same, and the end of the stroke doesn't have a hard stop (which is where I suspect the internal spring in the rod comes into play). I'll let you know later (probably tomorrow) how it goes.
 
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