Springs binding in my Shorty 45

[03Fatboy]

Tom 45,
You might look into modifying an alternate guide rod. The smaller diameter shouldn't be an issue since the ISMI springs will hold it center in the spring tunnel.

Just curious, why do you want to the run the ISMI? I run factory springs in my 6906 with no issues.

 

[BMCM]

BMCM...
Did you do anything special to turn down the oversized guide rod and still have it fit (look) OK in the larger opening in the slide?
I just measured my 6906 guide rod and it looks about 0.290".
I'm worried that if I turn it to 0.250" for the entire length the face of the slide may look too "loose".

As to the CS9-CS45 springs I purchased the "Glock 17" spring with the idea of getting 2 springs out of it...

We'll see what happens!
Thanks again for all your reports on this subject.

Tom

All the guns using a single recoil spring have a .290 guiderod. Those calling for the dual nested spring set have a .236 guiderod. Setting up to run a flatwire spring calls for making a guiderod of .250 or so.

Note that this endeavor is a workaround for the lack of the nested dual spring set. Additionally the most recent spring sets from S&W would coil bind in my Shorty45.

6906 springs are still readily available from Wolff so, I too am curious as to why you're looking into this for that particular gun.

Also be aware you must use a late version solid one piece stainless guiderod for this. An aluminum or steel staked unit simply will not work.

Nothing special about the machining. For my most recent one, I turned it to .260 for a little bit nicer & closer fit on the spring. Yes there's a little bit of gap at the slide tunnel exit hole if you look closely but the spring is such that it also serves as a bushing to keep the guiderod in perfect alignment, just like this:

That one is my 4566TSW with a guiderod turned to .255 and inside there is a 17# 36 coil ISMI spring.

Cheers
Bill

 

[tom 45]

There is no real reason to convert the 6906 to flat springs.
I'm kind of planning for the future.
I did order a replacement spring from Wolff...

I guess I'm just a tinkerer.

If I did it I'd make a new guide rod.
Of course I'd have to figure out how to do the inner end!

My big concern was the look at the front of the slide...
That fear is over... That slide looks excellent.

Thanks guys.

 

[BLUEDOT37]

Slide velocity

Slide to frame contact is not a bad thing so long as it's controlled. A soft landing on the frame by a properly sized spring of the correct weight for the loads is the goal... Uncontrolled slide to frame battering is. The two are not the same.

I was just reading a July 1989 article in Shooting Times on the development of the 10mm & S&W's autoloader for it. The prototype was a modified 4506. The related fact mentioned was that the slide to frame impact velocity of a 45ACP slide was found to be about 18fps. The 10mm was about a third greater at about 24-25fps. (The slide's top speed occurs about midway back in the cycle.) I had wondered how hard they hit the frame but never had seen any numbers. Just a tidbit that made me think of the recoil spring threads here. And by the way, their testing deduced, what's become well known, that the platform was "stronger than it needed to be".

 

[BLUEDOT37]

GL-22 in 1076

You know, If I were in your place I would give one of these a try for hotrod 10mm stuff.
ISMI Glock Full Size 24lb Recoil Spring G17,17L,20,21,22,24,31,34,35,37

Just need a solid stainless guiderod turned down to about 0.255ish and it'll be silky smooth... I did one for my 4566TSW and have one of those springs at 20# rating in there now. Works fine . Keep in mind, all the 4.25inch large frame guns used the same factory spring so I think you'd be golden in the 20# to 24# range.
Cheers
Bill

.

Just an update to say I installed a GL-22 (full size, not the GLC compact) ISMI flatwire spring in my 1076, on a modified guiderod (turned down to .255" dia.), & it installed without having to cut any coils. Test fired without issue. I also bought a 24# spring which I plan to try next trip to the range.