You are Unregistered, please register to use all of the features of!    

Firearm & Gun Forum - > Handguns > Revolver Handguns >

S & W Mod 15 Firing pin strike pressure ?

LinkBack Thread Tools Display Modes
Old 07-02-2009, 03:58 AM   #1
Feedback Score: 0 reviews
Join Date: Jul 2009
Posts: 5
Default S & W Mod 15 Firing pin strike pressure ?

I have an older S & W mod 15 that worked fine until the mainspring broke. This happened years ago and I had a gunsmith replace the mainspring.
When the work was done I put the gun away for a long time untested, I have since moved 1800 miles away from the gunsmith.
I took it out the other day and the firing pin does not strike the primer hard enough to fire, just a fine dimple.
When tested and looked at dry, the firing pin travels deeply enough to do the job on the primer and it is sound.
It looks to me, that the stress screw that acts on the mainspring can be moved to adjust the strength of the hammer blow.
I am looking for just a little direction from someone that is familiar with this action.

nonferrous is offline  
Reply With Quote

Join Today - It's Free!

Are you a firearms enthusiast? Then we hope you will join the community. You will gain access to post, create threads, private message, upload images, join groups and more.

Firearms Talk is owned and operated by fellow firearms enthusiasts. We strive to offer a non-commercial community to learn and share information.

Join Today! - Click Here

Old 07-02-2009, 04:06 AM   #2
Feedback Score: 0 reviews
masterPsmith's Avatar
Join Date: May 2009
Location: Barstow area, Kalifornia
Posts: 1,347
Liked 97 Times on 74 Posts
Likes Given: 25


Tighten down the strain screw. If it is already tight, the smith you took it to may have shortened it for a lighter double action trigger pull (and went too far). If so, replace the strain screw.


Last edited by masterPsmith; 07-02-2009 at 04:10 AM.
masterPsmith is offline  
Reply With Quote
Old 07-02-2009, 04:20 AM   #3
Feedback Score: 0 reviews
Join Date: Jul 2009
Posts: 5
Default Strain Screw.

Thanks Jim,
I just tried it and that strain screw is bottomed, it 's not going anywhere. I will take the grips off of one of my other 'K' frames and compare the screw length on them.
Thanks again, Len
nonferrous is offline  
Reply With Quote
Old 07-02-2009, 01:20 PM   #4
Lifetime Supporting Member
Feedback Score: 1 reviews
robocop10mm's Avatar
Join Date: Jul 2007
Location: Austin,Texas, by God!!
Posts: 11,395
Liked 4136 Times on 2111 Posts
Likes Given: 523


Main spring tension on a non-magnum S&W revolver should be 3 1/2 lbs. Magnums should be 3 3/4 lbs. Tension is measured by hanging trigger check weights off the hammer at the first notch below the hammer nose. It is easier to do than it is to explain.

+1 on the strain screw. Tension is adjusted by altering the length of the strain screw. A hack may not get it right.
In life, strive to take the high road....It offers a better field of fire.
"Robo is right" Fuzzball
robocop10mm is offline  
Reply With Quote
Old 07-03-2009, 04:29 AM   #5
Feedback Score: 0 reviews
Join Date: Jul 2009
Posts: 5
Default S&W hammer strike

Thanks for the info.
I pulled the strain screw and it has been shortened, I thought that trigger pull was too good to be true.
Anyway, I took a spent large pistol primer, cleaned it and flattened the inside with a small flat bottomed punch, this came out to about .015.
I slipped this over the end of the screw and the result is that now, the apparent hammer pressure is about the same as my other 'K' frames.
Next step is to check the actual weight as you have described and then back to the range.
Thanks again, Len

nonferrous is offline  
Reply With Quote

Thread Tools
Display Modes

Similar Threads
Thread Thread Starter Firearms Forum Replies Last Post
French report: Israel may be prepping for Iran strike Bigcountry02 Politics, Religion and Controversy 8 05-07-2009 12:20 AM
Will the inauguration result in a terrorist strike on DC tomorrow? matt g Politics, Religion and Controversy 24 01-20-2009 10:47 AM
owners of ship carrying arms strike deal Musket Politics, Religion and Controversy 2 12-01-2008 12:44 AM
Trigger pressure jmoore2020 General Handgun Discussion 5 09-26-2008 10:54 PM