Scorpion extra power recoil spring

[rss]

Is anyone aware of an extra power recoil spring for the scorpion? When I shoot suppressed (just about always) the brass lands about 15 feet away on the other side of the bench next to me and usually pisses of whoever is there. Just looking for an option to slow down the bolt when desired.


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None available commercially.

However, I used a short piece (about an inch and a half) of an extra power MP5 spring in conjuction with the factory spring.

Essentially, I put the mp5 spring coils inside the factory spring coils, and put them both up inside of the factory bolt.

Come to think of it, it may had been a short piece of AK47 spring. 

They're all 3 about the same diameter.

I do wish someone would make an extra power spring though. 

Like you, I think the gun could use it and would help everything all around.

Slow the bolt down some keeping it closed longer.  That would aid in velocity a little and would make it more quiet.

And not tick off the people 3 lanes down from wherever you set up.

Good idea. I was thinking about pushing a smidge more spring on there but don?t want any concerns about getting tangled and reliability. Of course, I know that if you want reliable then you should stay stock.


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[SouthernScorp]

Contact wolff gunsorings i think its gunsprings.com tell them what you need theyll custom cut you one for like $16-20. I had a few custom ejector springs made so my brass would quit ejecting so hard with factory spring it was denting case mouths against  the ejector port which if you dont reload your cases is fine but if you do "like me" the factory spring denting the case mouths was making reloading the brass a pain.

[Asylum9]

Let us know what you find out. I could use one also. Anything to help quite down that bolt a little.

[Asylum9]

I emailed HBI about the spring. They said they've played around with some recoil springs but the project went by the way side and won't be picked up any time soon.
I also emailed gunsorings  also but never heard anything back yet.
If someone comes up with any specific spring specs I'd be more than willing to help find a vendor to manufacture a few.

[HBi]

Direct blowback is beautifully simple, but not always intuitive. With respect to the design of the CZ Scorpion Evo our testing suggests that the mass of the bolt is far more significant in the bolt velocity/speed than is the force provided by the recoil spring (or springs). One of the constraints in the Evo is physical receiver space; if there was room for "theoretically infinitely long" spring or distance to the ejector we could definitely tune the bolt velocity with spring rates, but in the space given by design the bolt mass seems to win.

We have tried several different designs and combinations including "conventional" and "non-conventional" spring types with marginal results.

As for flinging brass, the Evo extractor is a reloaders nightmare... but what we have found is that tuning loads to suppressed/unsuppressed in order to achieve a desired bolt velocity or extraction pattern is the most effective way to deal with some of the issues presented in this thread. .02 cents :-)

[rss]

Direct blowback is beautifully simple, but not always intuitive. With respect to the design of the CZ Scorpion Evo our testing suggests that the mass of the bolt is far more significant in the bolt velocity/speed than is the force provided by the recoil spring (or springs). One of the constraints in the Evo is physical receiver space; if there was room for "theoretically infinitely long" spring or distance to the ejector we could definitely tune the bolt velocity with spring rates, but in the space given by design the bolt mass seems to win.

We have tried several different designs and combinations including "conventional" and "non-conventional" spring types with marginal results.

As for flinging brass, the Evo extractor is a reloaders nightmare... but what we have found is that tuning loads to suppressed/unsuppressed in order to achieve a desired bolt velocity or extraction pattern is the most effective way to deal with some of the issues presented in this thread. .02 cents :-)

Thanks for responding! I guess my main take away is the ?marginal results? comment.


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[oddballmkg]

I've been playing around with the extra power Wolff spring for the Mp5. The Mp5 spring is twice as long as the factory evo spring and is very close to the same dia. as the factory spring. For my first try, I used the stock Evo spring length and add two coils to the over all length of the wolf spring. The gun will cycle but it still needs little more spring weight. Next time, I'm going to try adding four more coils to the Wolff spring length to see how that works. I'm using my own 147 grain subsonic reloads that are traveling at 1050 feet per second with the Octane 9 suppressor.

[Border Dave]

Any updates to this thread?  Has anyone figured out a way to slow the bolt down in a Scorpion Evo?

[Manticore_Arms]

Any updates to this thread?  Has anyone figured out a way to slow the bolt down in a Scorpion Evo?

Just spitballing here, but if there is space in the Scorpion bolt, drilling and inserting tungsten weights would increase the inertia of the bolt and slow down its unlocking. It was commonly done in the Uzi community for the mini and micro uzis.

Sven
Manticore Arms

[Asylum9]

That hole in the evo bolt is for air flow / pressure differential I believe. I don't think the bolt would function correctly without that hole. Or could possibly damage the plastic frame.