Appropriate mainspring for S&W 15-6


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heavyshooter
April 5, 2011, 01:59 PM
I am looking for the mainspring for a S&W 15-6 and I am also wondering who sells it.

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rcmodel
April 5, 2011, 03:20 PM
All S&W K,L & N mainsprings are the same.

The S&W Parts department sells them.

The Brownell's factory parts department sells them.
http://www.brownells.com/Default.aspx

Wolff gunsprings sells an aftermarket S&W spring that is also very very good.
http://www.gunsprings.com/index.cfm?page=items&cID=3&mID=58

But I am curious why you need one.
S&W mainsprings almost never break or wear out.

If you are getting light primer hits & misfires, tightening the strain screw fully in the front of the grip frame will fix it.

Folks commonly loosen them to get a tighter DA trigger pull.
Then they start getting miss-fires and action problems and wonder why.

The strain screw is not a trigger pull adjustment screw, and should be kept fully tightened.

rc

Japle
April 5, 2011, 04:25 PM
I do a lot of shooting with S&W revolvers and haven't found anything better than the Bang, Inc springs. Brownells has them.
Some guys like to play with different rebound spring weights, but the Bang spring does the job for me. YMMV.

Also buy an extended firing pin. It makes all the difference when you're looking for a fairly light DA pull and 100% primer ignition.

rcmodel
April 5, 2011, 04:29 PM
He has a 15-6.
He doesn't need an extended firing pin.

The firing pin is hammer mounted.

rc

Japle
April 5, 2011, 07:43 PM
You're right, RC. I didn't notice that.

I wish someone made an extended replacement for the hammer mounted firing pins. I have an older M29 that could use one.

heavyshooter
April 6, 2011, 12:48 AM
RC,

I was surprised by the weakened spring as well. I assumed that tightening the screw would address the problem. But when I tried to it was as tight as it could be. My smith said that the mainspring is rather light and maybe I would want to replace it.

madcratebuilder
April 6, 2011, 08:59 AM
Is it possible someone took a file to the strain screw. This is a common way of setting a lighter trigger pull. Compare the length to another screw in a revolver with good hammer tension.

Old Fuff
April 6, 2011, 11:32 AM
I wish someone made an extended replacement for the hammer mounted firing pins. I have an older M29 that could use one.

The length of hammer-mounted firing pins is seldom the cause of misfires. What is more likely is a headspace problem caused by cylinder end-shake, or excessively reduced mainspring tension - for whatever reason. A qualified gunsmith or the S&W factory can cure whatever, and replacing the firing pin won't be necessary unless the tip is broken.

DPris
April 6, 2011, 11:49 AM
I had a factory mainspring lose tension on a 28 a while back. It had to be replaced.
Does happen.
Denis

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