CFWa Bolt Recoil Spring coil count

[StenAtopia]

Probably discussed before. How many Recoil spring coils when using a M11a1 in 9mm with a CFW a bolt. Thanks.

 

[strobro32]

That is a difficult question. It depends on who sold the main spring,

Tom was selling "orange" springs. Orange refers to the paint Tom used to identify the 5 different springs he gave me to test. I have extra of those. For Orange 63-65 are best for. 380. 90 was best for 9mm on the M11A1.

I don't know what Sam was using. He included 2 springs so people could tune it themselves.

 

[Slowmo]

What Sam told me when I asked substantially the same question:

“The spring is an M11/9 spring cut to 66 coils. Start with 5 coils longer.”

 

[StenAtopia]

Yes Sam said a plain m11/9 spring, but wouldn’t elaborate how many coils? So SLOWMO your saying cut a m11/9 spring down to 71 coils?

 

[Slowmo]

Yes Sam said a plain m11/9 spring, but wouldn’t elaborate how many coils? So SLOWMO your saying cut a m11/9 spring down to 71 coils?

That is a direct quote from an email I have from Sam. I interpret it the same way you did. Start with 71 (understanding there could be runaways) and cut a coil at a time towards 66 until you are happy with the results.

 

[StenAtopia]

That is a difficult question. It depends on who sold the main spring,

Tom was selling "orange" springs. Orange refers to the paint Tom used to identify the 5 different springs he gave me to test. I have extra of those. For Orange 63-65 are best for. 380. 90 was best for 9mm on the M11A1.

I don't know what Sam was using. He included 2 springs so people could tune it themselves.

Want to sell a few orange springs?

 

[strobro32]

I have 2 left. I would sell one.

 

[strobro32]

I have 2 uncut springs that is 110-111 coils and 2 that are 70-71 coils. 1 uncut spring not enough for 2 - 9mm bolts or even a 9mm and a 380. With the cut springs its enough for a 9mm and a 380. Did you want parts for 9mm and 380?

 

[strobro32]

I tried to measure the "orange" springs but my calipers are not making accurate measurements off the flexible springs. The "orange" spring is about 12" long, After 5 tries, the numbers don't add up but they are basically .035"-.039" diameter wire, .276 -.280" OD, .206 -.208" ID.

 

[StenAtopia]

I tried to measure the "orange" springs but my calipers are not making accurate measurements off the flexible springs. The "orange" spring is about 12" long, The numbers don't add up but they are basically .035" wire, .280" OD, .208" ID. One of the numbers is off by .001".

Thanks. I’ll have to dig up a regular M11/9 spring and compare it.

 

[StenAtopia]

Anyone that’s using this platform have a coil count? Besides the referenced orange spring above. Thanks

 

[StenAtopia]

Sam sent me a video of what he uses. Looks like 86 coils? Hard to count. Lol

 

[CoffeeFreak]

Tom was playing with a lot of different springs. I have a bunch he gave me but I always used OEM springs. From What Beau Hawthorn (AKA theColtCollector) told me he would measure a new OEM 9mm spring against a new unused 380 spring and cut it an inch longer, then cut a coil at a time till he got the felt recoil and ROF he liked.

 

[Slowmo]

That is a direct quote from an email I have from Sam. I interpret it the same way you did. Start with 71 (understanding there could be runaways) and cut a coil at a time towards 66 until you are happy with the results.

I just realized after revisiting this thread that you were talking about running 9mm. The 66-71 advice was for .380. Hopefully I didn’t send you down the wrong path.

 

[StenAtopia]

I’d have to assume what stobro said. 90 coils and go down from there one at a time?

 

[Slowmo]

I’d have to assume what stobro said. 90 coils and go down from there one at a time?

Tom said 88-92 in this post:

https://www.uzitalk.com/forums/inde...-m11a1-9mm-with-cfw-a1-bolt.92136/post-820053

 

[StenAtopia]

Tom said 88-92 in this post:

https://www.uzitalk.com/forums/inde...-m11a1-9mm-with-cfw-a1-bolt.92136/post-820053

FANTASTIC SIR!! Thanks

 

[Sebastian]

CFWa Bolt Spring Help

I posted this in a previous thread but I think it got overlooked. Any of you great UT members have a “A” bolt that you use in a M11/9 know what color spring and coils? What I’m inquiring about below. Bought it used second hand and I don’t know if the spring is correct or not. Thank you. Does...

www.uzitalk.com

See post #17!

 

[StenAtopia]

I tried to measure the "orange" springs but my calipers are not making accurate measurements off the flexible springs. The "orange" spring is about 12" long, After 5 tries, the numbers don't add up but they are basically .035"-.039" diameter wire, .276 -.280" OD, .206 -.208" ID.

Just got some m11/9 springs from MPA. They have a WD of .039. ID of .207 and OD of .278. Interesting…………..🤨

 

[StenAtopia]

edit above. My caliber was messes up. The Id is .200. Od is .285 and WD is .40/.41