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Old 01-13-2021, 06:03 PM
Ed58 Ed58 is offline
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Default CS9 Needed a Recoil Spring

When I buy a used semi auto, I always replace the recoil and mag springs. Unless I forget....
Several years ago I bought a used CS9 and intended to replace the springs, but unlike 3913 springs, I couldn't find them anywhere. So I added it to my long list of things to do. In the meantime the CS9 shot great; accurate and 100% reliable.
Last month I took it to the range and experienced failures to return to battery?! The slide had to be pushed forward 3/8 inch or so on a number of rounds, independent of ammo type.
I have owned seven 3rd Gen Smiths, and this was the FIRST TIME I had ever experienced an issue with any of them. In fact, I'm still waiting for my first FTF or FTE.
Luckily, I was able to buy a recoil spring (plus 2 spares) online. Put it in today, and the CS9 just cycled ~50 rounds with no issues whatsoever. If ammo wasn't so scarce and pricey these days, I'd still be at the range. For a small 9mm, that gun sure is a joy to shoot. Looks like the problem was my fault for dropping the ball on routine maintenance.
So, the moral of the story is replace those 3rd Gen recoil springs every 5 years or 5k rounds, whichever comes first. And don't forget to keep half an eye on that To Do list.
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Old 01-13-2021, 06:14 PM
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The CS9 is a GREAT little 9mm. I was shooting mine today. Accurate and reliable IF .you keep it maintained.

I use synthetic grease on the frame rails and change my recoil AND mag springs every 3 years or 3K rounds, whichever comes first. But I shoot mine a lot too.

Enjoy yours! Regards 18DAI
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Old 01-13-2021, 06:22 PM
Ed58 Ed58 is offline
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Synthetic grease here as well. I think it makes sense on fast moving parts like the slide, especially with an alloy frame. Forgot to mention for the benefit of other CS9 owners, Midway had the recoil springs on backorder, and they arrived in my mailbox in about 10 days.
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Old 01-13-2021, 07:06 PM
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How many do you need or want??
Contact me via PM....
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Old 01-13-2021, 08:12 PM
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I just ordered a bunch of parts for my 3rd Gens, including a spare recoil spring for my CS9.

Both Midway and Brownells still carry some parts for the 3rd Gens, but availability can be iffy.

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Originally Posted by Ed58 View Post
Synthetic grease here as well. I think it makes sense on fast moving parts like the slide, especially with an alloy frame. Forgot to mention for the benefit of other CS9 owners, Midway had the recoil springs on backorder, and they arrived in my mailbox in about 10 days.
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Old 01-15-2021, 05:54 PM
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I just stumbled on Fastbolt’s detailed answer to a fellow member who was having the exact same problem with their CS9. Dated 8-16-14, 9:31 pm.
One point that really caught my eye was his practice of replacing those flat CS9/45 recoil springs even more frequently: 2-3 years or 800-1200 rounds +/-. That plus 18DAIs post above have me thinking...at about $4 per spring, why not replace it every 2-3 years.
There was a bunch of other good info in his post and that thread as well.
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