possibility of a sw 99 double recoil spring

Crazy K38 · May 20, 2009

I have a SW99 and am wondering how possible if any would it be to build a double recoil spring assembly for this pistol. I have shot a Desert Eagle .50 AE and LOVED the recoil springs and it got my brain ticking. help would be greatly appreciated

Crazy K38 · May 20, 2009

forgot to mention this pistol is chambered in .40 caliber

sar4937 · May 21, 2009

http://sprinco.com/recoil.html Sort of what you are looking for. They are high quality, I use them in my raceglocks.

bountyhunter · May 21, 2009

Be careful using these on striker fired guns. On some of those, the recoil spring is basically what holds the slide in battery as you pull the trigger against it. These dual rate spring setups have very light resistance in battery, and it gets progressively stiffer as the slide goes back and does prevent the slide from hitting the frame.

On my Glock 35, the slide would pull slightly out of battery because the dual rate spring setup was not stiff enough at full extension (slide fully forward) when the trigger was pulled.

Anyway, just be advised. YMMV.

If you want one, I like the ones they sell at norecoil.com better than the springco units which I have not been thrilled with for durability or finish quality.

http://www.norecoil.com/

Crazy K38 · May 21, 2009

well I was thinking like the 50 cal, how it has two seperate springs one on each side of the barrel

sar4937 · May 21, 2009

A spring on each side of the barrel? How were you going to do that? As long as the recoil spring is sufficient, the secondary spring only functions as a buffer.

Crazy K38 · May 22, 2009

well when you disasemble the gun you see one fat spring hooked on a ledge in the barrel, now instead of one fat spring two slender but high compression springs side by side in tandem using the same mounts, theory, slightly higher resistance equals a lower felt recoil and makes my .40 less snappy

bountyhunter · May 22, 2009

Originally posted by Crazy K38:
instead of one fat spring two slender but high compression springs side by side in tandem using the same mounts, theory, slightly higher resistance equals a lower felt recoil and makes my .40 less snappy

Actually, the "recoil reducer" spring assemblies work using the opposite principle: the dual rate springs have a very weak resistance from the first spring which is in effect at firing, allowing the slide to come out of battery at a lower recoil energy level. The moving slide/barrel mass absorbs some recoil energy and act to reduce the peak recoil impulse by spreading the energy out over time. The second (stiff) spring begins to engage about halfway back and stops the slide from ever reaching the frame.

sar4937 · May 23, 2009

I think the 50 cal Desert Eagle has two small springs only because they could not get a single spring to do the job, seems to me the 357 Desert Eagle only has one. The slide is massive, and that alone will make the Desert Eagle feel different/impressive. My recoil reducer has the same weight spring as the OE recoil spring on my G21, I do have a light spring on my G17L. The secondary spring is only a half inch in length, so I doubt it picks up half way back. Recoil is cancelled by dissapating inertia, and slowing the slide before it hits the stops. Crazy K38, it sounds like you could accomplish the same end using a heavier stock spring. But the recoil spring only has to control the slide movement, and going heavier can cause other problems. It's never a good idea to try and reinvent the wheel. The recoil spring weight only has to match the load used, and I download for matches.

Crazy K38 · May 23, 2009

thanks guys just wanted to run my theory by you the recoil on my sw99 really isnt bad but with any gun something could be better

bountyhunter · May 23, 2009

Originally posted by sar4937:
My recoil reducer has the same weight spring as the OE recoil spring on my G21,

It may be rated the same, but "recoil reducers" (by virtue of what they are trying to do) must use progressive rate springs. If you get a springco or norecoil.com unit, you will feel it. When the slide is just coming out of battery, there is significantly less resistance than if a stock spring is used.

Originally posted by sar4937:
The secondary spring is only a half inch in length, so I doubt it picks up half way back.

The point is, the first portion if slide travel is against a lighter than stock spring which reduces felt recoil. The heavy final spring which kicks in farther back in the slide stroke prevents the slide from hammering the frame.

My point was that any gun which is striker fired can have a problem using this system: the slide houses the striker, whose movement is opposed by a strong spring. The trigger assembly is in the frame which is pushing against a tab on the striker. If the amount of recoil spring force in battery is too light, the slide will come to rest slightly out of battery in designs which return to battery "fully cocked". In the case of a Glock (partially cocked in battery), you may see the slide shift slightly rearward as the trigger is pulled which is drawing the striker back against it's spring. I saw that on my G35, so I went back to the stock mainspring and it does not have the problem. The gun still fired OK even with the slight slide shift, but I did not like the slide moving.

sar4937 · May 23, 2009

I understand what you're talking, that is not happening with my Sprinco setup. I agree that the rates should be progressive, but what I have functions more like a spring loaded buffer. It barely has 1/4 inch of very stiff travel to the secondary side. I have checked for this problem. My 17L had issues stripping rounds from the magazine on light loads. So I went with a lighter spring. But I also do not have any stock internals on the 17L. It's my understanding that most all the fullsize small frame Glocks share the same recoil spring from the factory. http://www.lonewolfdist.com/Detail.aspx?PROD=393

bountyhunter · May 23, 2009

If your Glock doesn't crawl back during trigger pull, that's good. But, I was advising people to watch out. The whole Glock design is a tale of three springs: the trigger bar has it's spring, the striker has it's spring, and the net trigger pull is dependent on both of those. But, the stronger the striker spring is, the more it pulls against the recoil spring in battery as the trigger is pulled which makes it try to pull OB. It can happen, and you have to be careful when screwing around with the recoil spring if the other springs are being varied. I didn't realize it until after I had spent the $70 on the "recoil reducer" recoil spring assy...... which is for sale at a discount if anybody wants it.

possibility of a sw 99 double recoil spring

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