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Stove pipes. Need lighter recoil spring?


Lucreau
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Got my S2 slide back from getting cut up for CO. Running an 11lb recoil spring. Got maybe 5 stove pipes in 400 rounds today. Would I need a lighter recoil spring?? Or a heavier spring to give the case more time to extract 

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Edited by Lucreau
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I’m running off the shelf magtech 124gr 9mm. Haven’t chrono’d yet, but with their on the box velocity should be around 135PF. I ordered a 10lb spring, and also an extra power extractor spring to see if that’ll help rip the case out better

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Looks like your extractor has let go before engaging the ejector, that or you have a damaged ejector. Not real familiar with CZ/Tanfo geometry, but I'd say you have an ejector/extraction problem not a recoil spring problem. Thats way down there. already.
How far is your brass flying that does eject ?

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Any chance your machining or one of the optic screws somehow is interfering with the extractor? I’d pull the top end apart and inspect it, with a new extractor spring ready to be installed while I was in there.

 

On a tanfo at least, you can slide an empty case up into the breechface beneath the extractor and it should hold onto it pretty aggressively.

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So I got the gun in and it went right out for milling so I hadn’t shot it in its stock configuration. 
im able to put a piece of brass in the breach face and knock it on my work bench and it holds the brass. 
I did order an extra power extractor spring and a 10# recoil spring. 
one thing I did realize is that the shadow 2 comes with a shock buff installed, and to me the stroke is very short. I’ll be pulling the shock buff as well to help the slide move more rearward. 

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The gun is made to run with the shock buff, leave it. Again, my guess is the added weight of the optic is slowing down the slide a lot. You may even need a 9lb spring. That optic looks heavy.

In my 9mm 1911, I run a 10lb spring, sometimes going to 9lb. So that 11lb spring, with the added weight of the optic, is slowing down the slide a lot.

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1 hour ago, Postal Bob said:

The gun is made to run with the shock buff, leave it. Again, my guess is the added weight of the optic is slowing down the slide a lot. You may even need a 9lb spring. That optic looks heavy.

In my 9mm 1911, I run a 10lb spring, sometimes going to 9lb. So that 11lb spring, with the added weight of the optic, is slowing down the slide a lot.

I got a 10lb and a 9lb spring headed my way, hopefully that’ll do the trick 

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  • 1 month later...

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