Smith & Wesson Forum

Go Back   Smith & Wesson Forum > >

S&W-Smithing Maintenance, Repair, and Enhancement of Smith & Wesson and Other Firearms.


Reply
 
Thread Tools Display Modes
  #1  
Old 09-09-2021, 07:47 PM
MarkL_01 MarkL_01 is offline
Member
Interchangable front sight and zero, 625 JM Interchangable front sight and zero, 625 JM Interchangable front sight and zero, 625 JM Interchangable front sight and zero, 625 JM Interchangable front sight and zero, 625 JM  
Join Date: Oct 2011
Posts: 200
Likes: 56
Liked 154 Times in 64 Posts
Default Interchangable front sight and zero, 625 JM

This is not so much gun-smithing as parts-changing. I put a HIVIZ fiber optic front site on my 625-8 JM. I had to shorten the 'feet' on the base of the sight and slightly narrow the base to get it into the slot on the barrel. No filing was done on the revolver. Elevation didn't change, but the point of impact was changed substantially to the left, such that the rear sight adjustment range would not center the group at 25 yards.
I took the sight off and put the original back on. Just slipped it back in, no fitting of course. The point of impact at 25 yards is still substantially left of center; about 2 inches left with the rear sight all the way to the right.

Any idea what I might have done to cause this?

The barrel seems to be very slightly canted to the right, so that the edge of the barrel rib is a little closer to the edge of the frame on the right side, but getting a good center zero did not require the rear sight to be much off of center before I messed with the front sight.

Thanks for any suggestions, or even ridicule (although I'd probably just ignore that). <smile>

-Mark
Reply With Quote
  #2  
Old 09-13-2021, 10:14 PM
brian_a_mcmillen brian_a_mcmillen is offline
Member
Interchangable front sight and zero, 625 JM Interchangable front sight and zero, 625 JM Interchangable front sight and zero, 625 JM Interchangable front sight and zero, 625 JM Interchangable front sight and zero, 625 JM  
Join Date: Feb 2012
Location: Anderson, Indiana
Posts: 45
Likes: 12
Liked 3 Times in 3 Posts
Default

I recently had the same issue with a model 13-2 that had a barrel change and because it was "clocked" slightly to the right (as you're looking at the sight as you're shooting) it shot about 3" left at 50'. I took it back to my smith and had him torque it more which centered the front sight, it now shoots fine. As it turns out, a few degrees off center make a huge difference at distances.

Brian
Reply With Quote
  #3  
Old 09-14-2021, 12:23 AM
Gunhacker's Avatar
Gunhacker Gunhacker is offline
SWCA Member
Interchangable front sight and zero, 625 JM Interchangable front sight and zero, 625 JM Interchangable front sight and zero, 625 JM Interchangable front sight and zero, 625 JM Interchangable front sight and zero, 625 JM  
Join Date: Oct 2002
Location: SF East Bay - "the delta"
Posts: 3,297
Likes: 1,188
Liked 3,650 Times in 1,334 Posts
Default

How does the front sight look? Might it be canted too?

Checkout my post regarding my 625-8 experience with a canted barrel and a canted Hi-Viz sight blade:

2 wrongs sometimes makes it right
__________________
Conrad
SWCA #1830 SWHF #222
Reply With Quote
The Following User Likes This Post:
  #4  
Old 09-14-2021, 06:08 PM
MarkL_01 MarkL_01 is offline
Member
Interchangable front sight and zero, 625 JM Interchangable front sight and zero, 625 JM Interchangable front sight and zero, 625 JM Interchangable front sight and zero, 625 JM Interchangable front sight and zero, 625 JM  
Join Date: Oct 2011
Posts: 200
Likes: 56
Liked 154 Times in 64 Posts
Default

Quote:
Originally Posted by Gunhacker View Post
How does the front sight look? Might it be canted too?

Checkout my post regarding my 625-8 experience with a canted barrel and a canted Hi-Viz sight blade:

2 wrongs sometimes makes it right
I will read your post. Thanks for sending the link.

I'm second-guessing my statement that this problem started with the installation of the Hi-Viz sight. I'd only shot this revolver casually at short ranges before, and I don't think I'd previously adjusted the sights. I've had it for several years, but have only shot maybe 100 rounds through it.

With the original sight reinstalled, the group was 2 1/2" left at 25 yards (measured this time, instead of 'ballpark'). Neither sight seemed noticeably canted.

Looking from the muzzle, the top of the rib is obviously not level with the top of the frame. Measuring from the edges of the rib to the corners of the frame, I get 0.36" on one side and 0.18" on the other.

Just messing around today, out of curiosity I cut a slot in the Hi-Viz sight to let it sit farther to the left (fitting over the ridge on the inside of the slot in the barrel rib) and shimmed it to keep it there. I'm going to see what that does at the range and then I'll probably give S&W a call.

Thanks for your reply.

-Mark
Reply With Quote
  #5  
Old 09-14-2021, 08:57 PM
MarkL_01 MarkL_01 is offline
Member
Interchangable front sight and zero, 625 JM Interchangable front sight and zero, 625 JM Interchangable front sight and zero, 625 JM Interchangable front sight and zero, 625 JM Interchangable front sight and zero, 625 JM  
Join Date: Oct 2011
Posts: 200
Likes: 56
Liked 154 Times in 64 Posts
Default

Quote:
Originally Posted by Gunhacker View Post
How does the front sight look? Might it be canted too?

Checkout my post regarding my 625-8 experience with a canted barrel and a canted Hi-Viz sight blade:

2 wrongs sometimes makes it right
That was an interesting read. I'm sad that others are getting revolvers that have assembly problems, too, but at least I know it's not just me.

The comment that most have no problems might be correct. I only have three post-1980 revolvers, the other two are 629-6 and they're just about perfect. I had a model 15 from 1980, and running the rear sight to the end of its adjustment would not even bring the shots into the black at 25 yards.
I traded that for one of the 629s.

-Mark
Reply With Quote
  #6  
Old 09-14-2021, 10:06 PM
Gunhacker's Avatar
Gunhacker Gunhacker is offline
SWCA Member
Interchangable front sight and zero, 625 JM Interchangable front sight and zero, 625 JM Interchangable front sight and zero, 625 JM Interchangable front sight and zero, 625 JM Interchangable front sight and zero, 625 JM  
Join Date: Oct 2002
Location: SF East Bay - "the delta"
Posts: 3,297
Likes: 1,188
Liked 3,650 Times in 1,334 Posts
Default

I only have three "recent" models of S&W revolvers. After the 625-8 experience, I really inspected my next potential purchase with a fine tooth comb.

I was looking at the new 4" bbl M69 L-Frame .44 Mag revolver, I had to go to three gun shops before I found one that did not have a canted barrel... pretty sad comentary.
__________________
Conrad
SWCA #1830 SWHF #222
Reply With Quote
  #7  
Old 09-14-2021, 11:05 PM
Baltimoreed11754's Avatar
Baltimoreed11754 Baltimoreed11754 is online now
Member
Interchangable front sight and zero, 625 JM Interchangable front sight and zero, 625 JM Interchangable front sight and zero, 625 JM Interchangable front sight and zero, 625 JM Interchangable front sight and zero, 625 JM  
Join Date: Aug 2015
Posts: 435
Likes: 179
Liked 804 Times in 276 Posts
Default

I had to return a .45 acp Thunder Ranch back to Smith to have a shorter front blade and the bbl turned. It was obviously off, don’t know what the bbl installer was thinking. Shoots ok now though. I also did a high viz on my 625 JM as it’s my zombie match gun. Whole lot easier picking up the front sight now.
Reply With Quote
  #8  
Old 09-17-2021, 02:14 PM
MarkL_01 MarkL_01 is offline
Member
Interchangable front sight and zero, 625 JM Interchangable front sight and zero, 625 JM Interchangable front sight and zero, 625 JM Interchangable front sight and zero, 625 JM Interchangable front sight and zero, 625 JM  
Join Date: Oct 2011
Posts: 200
Likes: 56
Liked 154 Times in 64 Posts
Default

Quote:
Originally Posted by Gunhacker View Post
I only have three "recent" models of S&W revolvers. After the 625-8 experience, I really inspected my next potential purchase with a fine tooth comb.

I was looking at the new 4" bbl M69 L-Frame .44 Mag revolver, I had to go to three gun shops before I found one that did not have a canted barrel... pretty sad comentary.
That is sad.

The only new revolver I might consider at the moment would be a 4" Model 19. Hopefully, having a barrel shroud separate from the actual barrel would avoid this issue. I haven't tried to find out anything about that yet, though.

-Mark
Reply With Quote
  #9  
Old 09-17-2021, 02:16 PM
MarkL_01 MarkL_01 is offline
Member
Interchangable front sight and zero, 625 JM Interchangable front sight and zero, 625 JM Interchangable front sight and zero, 625 JM Interchangable front sight and zero, 625 JM Interchangable front sight and zero, 625 JM  
Join Date: Oct 2011
Posts: 200
Likes: 56
Liked 154 Times in 64 Posts
Default

Quote:
Originally Posted by Baltimoreed11754 View Post
I had to return a .45 acp Thunder Ranch back to Smith to have a shorter front blade and the bbl turned. It was obviously off, donít know what the bbl installer was thinking. Shoots ok now though. I also did a high viz on my 625 JM as itís my zombie match gun. Whole lot easier picking up the front sight now.
My current interest in the 625 is to try it in a steel challenge match. I'm tired of losing brass. <smile>

I've had this revolver for a good while, but so far had only plinked with it at short ranges and hadn't tried to adjust the sights.

-Mark
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
(FOUND) WTB front sight screw for 1939 Officers Model Target adjustable front sight moosedog WANTED to Buy 0 06-09-2021 07:09 PM
Interchangable front sights twodog max Smith & Wesson - The Wish List 4 01-27-2017 10:53 AM
Plain Patridge .250" Interchangable Sight? TAROMAN S&W Revolvers: 1980 to the Present 1 07-08-2014 08:22 PM
Changing the "interchangable" front sight on a new M627 Pro. andyo5 S&W Revolvers: 1980 to the Present 4 02-29-2012 09:33 AM
Interchangable Front Sight for a 610 LubeckTech S&W-Smithing 1 10-11-2009 09:56 PM

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 04:01 PM.


Search Engine Optimisation provided by DragonByte SEO v2.0.42 (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Smith-WessonForum.com is not affiliated with Smith & Wesson Holding Corporation (NASDAQ Global Select: SWHC)