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 02-03-2020, 01:33 PM
pantannojack pantannojack is offline
Member
Barrel Setback Barrel Setback Barrel Setback Barrel Setback Barrel Setback  
Join Date: Jun 2011
Location: the ready line, N. Idaho
Posts: 107
Likes: 56
Liked 107 Times in 53 Posts
Default Barrel Setback

Thinking about bbl setback to cure excessive Air Gap, or determining if this has been done previously on for sale revolver. First How is bbl altered to go deeper into the frame? Is the frame and yoke shaved to allow the bbl to rotate one more time on the threads? Or is the bbl flange machined the required amount to allow same? Or can the bbl stud at forcing cone area be stretched in some way to gain length with out shaving the frame and yoke, or setting back the bbl flange? Then, is it necessary to shorten the center pin and extractor rod to accommodate the shorter dimension to the Locking Bolt? Revolvers in question are one pre mod 27 looking tight in the end of extractor rod to locking bolt relationship with pin sticking forward from locking bolt recess groove while cylinder is closed. One other revolver is 29-3 in proper time and no endshake showing more than .010 air gap. Is there a possibility in twisting or damaging the frame on non pinned 29-3 revolver thru removing and replacing said bbls?
__________________
"Don't Know no Felix"
Reply With Quote
  #2  
Old 02-03-2020, 02:56 PM
robertrwalsh robertrwalsh is offline
Member
 
Join Date: May 2008
Location: Peoples Republic of California.
Posts: 2,758
Likes: 368
Liked 2,358 Times in 1,005 Posts
Default

It is my understanding that the CORRECT way to do this is to relieve the barrel rear face rather than shave the frame. You pretty much ALWAYS remove metal from the cheaper, more easy to replace part. I have seen a Colt New Service that had the front of the frame relieved, badly, and ended up with the barrel pointing down noticably. There is always the possibility of tweaking the frame, but if you have a competent man with a good frame wrench it isn't at all likely. If you only have one or two turns it isn't usually a problem for the extractor rod. It isn't that hard to shorten an extractor rod if necessary. I had this done with a 625 that was spitting badly and had an obvious angle on the forcing cone. After the work it shoots beautifully and wasn't terribly expensive.
Reply With Quote
The Following 2 Users Like Post:
  #3  
Old 02-03-2020, 08:42 PM
WR Moore WR Moore is offline
Member
 
Join Date: Oct 2006
Posts: 4,135
Likes: 222
Liked 2,231 Times in 1,211 Posts
Default

Quote:
Originally Posted by pantannojack View Post
Thinking about bbl setback to cure excessive Air Gap.................. Then, is it necessary to shorten the center pin and extractor rod to accommodate the shorter dimension to the Locking Bolt?
Yes, it's usually necessary to shorten the center pin and extractor rod. Setting the barrel back one turn moves the barrel 0.0277 in rearward.

Quote:
Revolvers in question are one pre mod 27 looking tight in the end of extractor rod to locking bolt relationship with pin sticking forward from locking bolt recess groove while cylinder is closed.
Not sure what you're describing, but if you can see the center pin sticking out beyond the end of the extractor when the cylinder is closed, something is wrong.

Quote:
One other revolver is 29-3 in proper time and no endshake showing more than .010 air gap. Is there a possibility in twisting or damaging the frame on non pinned 29-3 revolver thru removing and replacing said bbls?
If the proper tools aren't used, it's always possible to damage a frame while removing/installing barrel. Contrary to myth, there's no difference in torque on the barrels between pinned/non pinned barrels. Any threaded fit is managed by tension between the bolt head/nut/barrel shoulder and the threads. In extreme industrial applications, the threaded stud is stretched by a hydraulic jack and the nuts are spun down by hand.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Temporary setback vicikid62 Smith & Wesson M&P Pistols 2 12-23-2016 11:58 PM
Bullet setback fbcmrjrtykr Smith & Wesson M&P Pistols 15 02-17-2015 09:57 AM
Question on Setback thirtydaZe Concealed Carry & Self Defense 16 02-24-2014 11:06 AM
Barrel Setback? Doug Cook S&W-Smithing 5 05-29-2009 02:16 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 04:36 PM.


Search Engine Optimisation provided by DragonByte SEO v2.0.42 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
S-W Forum, LLC 2000-2020
Smith-WessonForum.com is not affiliated with Smith & Wesson Holding Corporation (NASDAQ Global Select: SWHC)