Smith & Wesson Forum

Go Back   Smith & Wesson Forum > >


Reply
 
Thread Tools Display Modes
  #1  
Old 06-28-2018, 10:07 AM
GypsmJim GypsmJim is offline
Member
Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4  
Join Date: Oct 2009
Posts: 540
Likes: 1
Liked 335 Times in 164 Posts
Default Light Strikes on a S&W Model 19-4

I've owned the gun for 10 years or more and have not had a problem before. When I bought it the PO said it had a "trigger job", and it's evident by its very light trigger pull. However, its also the most accurate S&W I own.

Recently started having light strikes and no fire. Using handloads. Naturally, the first thing I did was check primer seating and that was OK. If I try hitting it a second time, maybe it will fire maybe not. Yesterday it took 4 tries with one round. If it doesn't fire on the second try, its still a light strike. When it finally does fire, the primer strike is normal.

I can go thru several cylinder reloads and it won't happen. Then, it starts again.

The same ammo is 100% OK in another .357 revolver.

Any suggestions appreciated...
Reply With Quote
  #2  
Old 06-28-2018, 10:16 AM
Rpg Rpg is online now
Member
Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4  
Join Date: May 2013
Location: Denver area
Posts: 3,544
Likes: 8,233
Liked 5,941 Times in 2,065 Posts
Default

Be sure the strain screw is tightened down.

Trigger work often includes backing the strain screw out a bit and can back out further over time.

Last edited by Rpg; 06-28-2018 at 10:27 AM.
Reply With Quote
The Following User Likes This Post:
  #3  
Old 06-28-2018, 10:24 AM
nachogrande nachogrande is online now
Member
Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4  
Join Date: Nov 2012
Location: Gods waiting room, W/C FL
Posts: 2,310
Likes: 2,036
Liked 2,614 Times in 1,176 Posts
Default WHAT DID THE "TRIGGER JOB" ENTAIL?

If it worked fine for 10 years, it sounds like something has changed. (duh) Start with the simple/easy/cheap stuff first IMO. Look at the (hammer mounted?) firing pin, FP channel clean/clear/lubed?, hammer pathway not gunked up?, springs weakened?, As mentioned above, has the strain screw loosened? still have the original springs?

Last edited by nachogrande; 06-28-2018 at 10:29 AM.
Reply With Quote
The Following User Likes This Post:
  #4  
Old 06-28-2018, 10:43 AM
GypsmJim GypsmJim is offline
Member
Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4  
Join Date: Oct 2009
Posts: 540
Likes: 1
Liked 335 Times in 164 Posts
Default

Quote:
Originally Posted by nachogrande View Post
If it worked fine for 10 years, it sounds like something has changed. (duh) Start with the simple/easy/cheap stuff first IMO. Look at the (hammer mounted?) firing pin, FP channel clean/clear/lubed?, hammer pathway not gunked up?, springs weakened?, As mentioned above, has the strain screw loosened? still have the original springs?
All good comments and all have been looked at.

Clean and oiled for sure. Strain screw tight. I don't know if the springs are original, since i bought it used, but I never changed anything. Springs weak? - how do i tell?
Reply With Quote
The Following User Likes This Post:
  #5  
Old 06-28-2018, 11:11 AM
Arquebus357 Arquebus357 is offline
Member
Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4  
Join Date: Oct 2017
Location: Atlanta GA
Posts: 157
Likes: 2
Liked 168 Times in 68 Posts
Default

You really can't tell without gunsmithing equipment. If it was me, I would buy a new hammer spring, install it, and see if that fixes the problem. If it doesn't, I would need to look for another culprit.
Reply With Quote
  #6  
Old 06-28-2018, 12:17 PM
Toolguy Toolguy is offline
Member
Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4  
Join Date: Jan 2010
Location: Kansas City area
Posts: 1,457
Likes: 4,647
Liked 1,743 Times in 763 Posts
Default

In that situation, usually the main thing that changes is endshake. If the cylinder has too much play front to back, (more than .002), then the hammer may have to move the entire cylinder forward before there is anything solid to strike against. Moving the cylinder cushions the blow of the firing pin on the primer.

It could be something else too, we are just guessing without the gun in hand.
Reply With Quote
The Following 2 Users Like Post:
  #7  
Old 06-28-2018, 12:49 PM
ken158 ken158 is online now
Member
Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4  
Join Date: Nov 2005
Location: VA
Posts: 2,571
Likes: 445
Liked 1,292 Times in 658 Posts
Default

Most "trigger job" gunsmiths merely cut springs and filed the main spring screw to accomplish their task for unknowing gun owners. Cheap and quick but the end result often ends up where you are now. New springs and screw area a suggestion but someone of knowledge needs to see it.
Reply With Quote
  #8  
Old 06-28-2018, 12:59 PM
BC38's Avatar
BC38 BC38 is offline
Member
Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4  
Join Date: Nov 2013
Location: Spokane, WA
Posts: 5,987
Likes: 252
Liked 6,513 Times in 2,741 Posts
Default

If there is a possibility that the strain screw has been shortened maybe you could try shimming the screw with and empty primer cup over the end of the screw. It would be worth a try, and if it works you can go with that "fix" or get a replacement screw.
Reply With Quote
  #9  
Old 06-28-2018, 01:54 PM
1sailor 1sailor is online now
Member
Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4  
Join Date: Dec 2011
Posts: 1,103
Likes: 12
Liked 369 Times in 207 Posts
Default

I have a M686 that started doing the same thing. A couple of years ago I installed a Wolff ribbed mainspring. Gun never missed a beat until about a month ago. I was going to replace the spring but first tried the old primer with the guts removed trick. since then I've put around 800 to 900 rounds through it with no more issues. Not sure why it started with the light strikes all of a sudden but at least for now the primer trick seems to be working.
Reply With Quote
  #10  
Old 06-28-2018, 02:30 PM
David.Hylton David.Hylton is offline
Member
Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4  
Join Date: May 2012
Posts: 47
Likes: 7
Liked 44 Times in 12 Posts
Default

Any ammo changes or primer changes? I had a 640 that would not consistently fire Hornady ammo, but it would shoot everything else that I tried without issue.
Reply With Quote
  #11  
Old 06-28-2018, 03:03 PM
R*E R*E is offline
Member
Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4  
Join Date: Aug 2008
Posts: 154
Likes: 60
Liked 82 Times in 47 Posts
Default

Did you clean the cylinders thoroughly so that the rounds are fully seated? If the cylinders have carbon rings, the hammer strikes will push the rounds forward until they are seated.
Reply With Quote
  #12  
Old 06-28-2018, 07:26 PM
GypsmJim GypsmJim is offline
Member
Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4  
Join Date: Oct 2009
Posts: 540
Likes: 1
Liked 335 Times in 164 Posts
Default

Endshake is not detectable - its tight as a drum.

The strain screw sure looks like it hasn't been touched. I compared it to other Smiths.

The brass is the same, as are the primers, except for maybe a new brick. I only use CCIs.

As a matter of fact, it started after my mid-Winter gun cleaning marathon. I do all my guns in the off season. The cylinders look fine.

Now that i think of it, the only change was the load and the bullets. I used to use 158 SWC lead, but switched to Berry's 158 plated for outdoor use. I guess next time I'll try a box of lead and see what happens...

Thanks for all the help so far...
Reply With Quote
  #13  
Old 06-28-2018, 08:53 PM
Tjohns42 Tjohns42 is offline
Member
Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4  
Join Date: May 2018
Location: Phoenix, AZ
Posts: 34
Likes: 5
Liked 21 Times in 16 Posts
Default

I just had a trigger job done and my local smith had a chart of pull weights that varied by primer brand. CCI was at something like 56oz on .38 special vs Winchester SP at 46oz (these numbers are specific to how he does his action jobs and should only be used as an example in this case). Those are some of the hardest primers you can buy. I would try to check your trigger pull and give your strain screw a nudge to see if that helps. If it started during your off season deep cleans you could’ve bumped that screw a little and a little is all it takes when you’re on the edge with your pull weight.
Reply With Quote
The Following User Likes This Post:
  #14  
Old 06-28-2018, 08:53 PM
Toolguy Toolguy is offline
Member
Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4 Light Strikes on a S&W Model 19-4  
Join Date: Jan 2010
Location: Kansas City area
Posts: 1,457
Likes: 4,647
Liked 1,743 Times in 763 Posts
Default

Bullets won't make any difference in misfires. CCI is the hardest primer to set off. I would take out the mainspring and straighten it out some, then put it back in and try that. It will make the trigger pull a little heavier, but may set off all the primers.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Model 12-1 light strikes Mzuri S&W Revolvers: 1961 to 1980 11 10-27-2017 05:58 PM
Light Primer strikes with a Model 69 bronco45 S&W-Smithing 4 06-18-2016 04:18 AM
Model 66-8 light strikes MattNH S&W Revolvers: 1980 to the Present 10 12-29-2015 11:59 PM
Light strikes - Model 10 rajbcpa S&W Revolvers: 1980 to the Present 16 06-10-2015 04:24 PM
Model 41 FTF light primer strikes dpsix S&W-Smithing 10 09-25-2012 12:14 AM

Powered by vBadvanced CMPS v3.2.3
smith-wessonforum.com tested by Norton Internet Security smith-wessonforum.com tested by McAfee Internet Security

All times are GMT -4. The time now is 12:07 PM.


S-W Forum, LLC 2000-2018
Smith-WessonForum.com is not affiliated with Smith & Wesson Holding Corporation (NASDAQ Global Select: SWHC)