Fitting P220 threaded barrel to P227 - SIG Talk
SIG Talk Gun Forum

Fitting P220 threaded barrel to P227

This is a discussion on Fitting P220 threaded barrel to P227 within the SIG Sauer Gunsmithing forums, part of the SIG Sauer Forum category; Please excuse me if I use a couple wrong names. I bought a new from Sig P220 phosphate threaded barrel to use in both my ...


Go Back   SIG Talk > SIG Sauer Forum > SIG Sauer Gunsmithing


SIG Sauer Gunsmithing Discuss SIG Sauer repairs, modifications, designs and builds here!

Like Tree1Likes
  • 1 Post By kennethk
Reply
 
LinkBack Thread Tools Display Modes
Old 08-22-2016, 05:19 PM   #1
Senior Member
 
Join Date: Feb 2013
Location: GA
Posts: 217
Fitting P220 threaded barrel to P227

Please excuse me if I use a couple wrong names. I bought a new from Sig P220 phosphate threaded barrel to use in both my P220 and P227. It fits fine in the P220 but not in the P227. Seems like the barrel fits the slide OK but the feed ramp hits the locking insert. The original P220 barrel, the P220 threaded barrel and the P227 barrel fit the P220 OK. The P220 slide and the P220 threaded barrel fit the P227 OK.

My problems is the P220 threaded barrel, in the P227, hits the feed ramp hit the locking insert.

Any thoughts?
Attached Images
File Type: jpeg File_002 (3).jpeg (1.05 MB, 20 views)
File Type: jpeg File_007.jpeg (768.3 KB, 15 views)
File Type: jpeg File_004 (1).jpeg (1.65 MB, 17 views)
File Type: jpeg File_006.jpeg (777.1 KB, 15 views)
File Type: jpeg File_003 (1).jpeg (1.48 MB, 12 views)
File Type: jpeg File_001 (5).jpeg (1.07 MB, 13 views)
File Type: jpeg File_000 (5).jpeg (1.07 MB, 17 views)

Last edited by kennethk; 08-23-2016 at 02:15 AM.
kennethk is online now  
Register

Welcome to the SIG Talk Forum dedicated to SIG Sauer Pistols and SIG Sauer Rifles.

We welcome everyone and the community is free to join so register today and become part of the SIG Talk Forum!

Old 08-22-2016, 06:08 PM   #2
Senior Member
 
Willard's Avatar
 
Join Date: Apr 2016
Location: Evansville, IN
Posts: 1,351
It sounds as if the threaded 220 barrel is not fitting up into the 227 slide high enough.
Once upon a time, when fitting barrels on 1911s, you would use a barrel alignment gauge that had a firing pin diameter locating pin. You would fit the upper lugs, until the locating pin would fit into the firing pin hole in the slides breach face. I don't know if something like that could be used or not. Because of the tilting action of the barrel locking into the slide, .001" can be a lot!

Did you measure hood lengths? Are all the same? Try some "Prussian blue" to see where your interference is.

Last edited by Willard; 08-22-2016 at 06:14 PM.
Willard is offline  
Old 08-23-2016, 02:13 AM   #3
Senior Member
 
Join Date: Feb 2013
Location: GA
Posts: 217
Barrel hoods are very close in length. I can 'push' the hood part of the barrel up into the slide just a hair so I don't think its too long. The pivot point seems to be where the end of the barrel goes thru the hole in the end of the slide but the barrel OD's are the same.

On all three barrels there are small dents on the bottom of the feed ramp where it hits the locking insert.
kennethk is online now  
 
Old 08-23-2016, 02:57 AM   #4
Senior Member
 
Willard's Avatar
 
Join Date: Apr 2016
Location: Evansville, IN
Posts: 1,351
The muzzle is not the "pivot" point, it is the action of the barrels bottom lug, the locking insert, and the take-down lug. Just as with a 1911, you have the bottom lugs, barrel link, and slide stop pin that the barrel pivots on while the slide moves horizontally, the barrel pivots up when slide closes, and the barrels upper lugs mate with lug recesses in the slide.
The rear of the Sigs' barrel rises into the ejection port cutout, and acts as one big lug, securing the barrel in the slide. You need to check the original barrels fit into their respective slides, and that is your aim to fit the replacement barrel. Your downfall could be expecting it to be the same in both slides. For it to fit properly in "Both" slides, it may be looser in one of them. Sigs tolerances are close, but if one slide is cut at minimum tolerance, and the other is cut at the maximum, you can see the problem. Plus you are talking 2 different models. I don't think you can expect perfection!
Willard is offline  
Old 08-23-2016, 04:26 AM   #5
Senior Member
 
Join Date: Feb 2013
Location: GA
Posts: 217
THX for the reply. By pivot I meant with the barrel in the slide the chamber end of the barrel can't go higher in the slide (unless I push it hard) because of the tight fit of the muzzle end of the barrel in the end of the slide. I can push the chamber end into the ejector port ~0.5 mm.

The threaded barrel in the P220 slide fits and works fine on the P227.

Your tolerances remarks make sense.
kennethk is online now  
Old 08-23-2016, 04:42 AM   #6
Senior Member
 
ThnkFrst's Avatar
 
Join Date: Mar 2012
Location: SEMI
Posts: 7,758
I think you are correct that the "pivot point" of the barrel is the bearing surface in the slide at the muzzle end.

It sounds like the barrel isn't fitting UP high enough in the slide for the feed ramp to clear the locking insert. If the length of the barrel hood fits in the slide ejection port opening, then the top of the barrel (just forward of the barrel hood) will need to be ground to allow the barrel to sit higher in the slide.

I see where one of the barrels in your pic has been ground this way. Am I correct that the center barrel is the original P220 barrel and the left one is the new threaded barrel? Have marked your pic to show the area in question:

P220 Bbl Fitting.001.jpg
ThnkFrst is online now  
Old 08-23-2016, 05:34 AM   #7
Senior Member
 
Join Date: Feb 2013
Location: GA
Posts: 217
Thanks ThnkFrst.
" If the length of the barrel hood fits in the slide ejection port opening" It does.

" then the top of the barrel (just forward of the barrel hood) will need to be ground to allow the barrel to sit higher in the slide." The top of the barrel does not touch the slide (unless I press the barrel up) so grinding more off would not help.

LEFT = Original P227 barrel
MIDDLE= Original P220 barrel
RIGHT = P220 threaded barrel

I'm wondering why all three have dings on the feed ramp where it hits the locking insert. Not sure if the P220 barrel had them before I put it in the P227. Maybe on the P227 slide the 'bearing surface' at the muzzle end is a really tight fit or just at a slight angle. Really tight fit is normally a good thing.
kennethk is online now  
Old 08-23-2016, 01:42 PM   #8
Senior Member
 
ThnkFrst's Avatar
 
Join Date: Mar 2012
Location: SEMI
Posts: 7,758
I does sound like the bearing surface in your 227 slide is tight, or tighter than your 220 slide.

I've only had one occasion to rework the slide bearing surface and that was to remove the finish after having it ceracoated. I don't have a course of action to recommend to you.
ThnkFrst is online now  
Old 08-23-2016, 02:55 PM   #9
Senior Member
 
Join Date: Feb 2013
Location: GA
Posts: 217
Barrel OD
227 - 0.588
220 - 0.588
Thrd - 0.589

Hood
227 - 1.3470
220 - 1.3485
Thrd - 1.3495

Thickness top of chamber to bottom of ramp
227 - 0.8320
220 - 0.8330
Thrd - 0.8295

Thickness top of chamber to bottom of lug
227 - 1.0965
220 - 1.0970
Thrd - 1.0980

Slide bearing surface
hard to measure accurately due to angle of hole top to bottom
Side to side is both 0.599
kennethk is online now  
Old 08-23-2016, 03:18 PM   #10
Senior Member
 
Join Date: Feb 2013
Location: GA
Posts: 217
Hard to measure I think its close
With the barrels in the slide
Distance from the top of the slide to the top of the chamber.
227 - 0.065
220 - 0.065
Thrd - 0.078
Thrd - 0.066 (if I press the chamber up into the slide with my fingers)(I may be wrong but this tells me the hood does not need to be ground)
kennethk is online now  
Old 08-23-2016, 03:51 PM   #11
Senior Member
 
ThnkFrst's Avatar
 
Join Date: Mar 2012
Location: SEMI
Posts: 7,758
You're right, the hole in the front of the slide is hard to measure. It's actually two holes machined on different horizontal axis.

If you insert the muzzle of the barrel in the slide (from the front of the slide) just enough to clear the bearing surface and push down on the breach end, do you see a difference in the angle of the barrel relative to the slide between your 220 and 227 slides?

I see the threaded barrel OD is 0.001" larger than the other two. That not a lot but it's not helping. How far back from the muzzle are you taking those measurements?

Last edited by ThnkFrst; 08-23-2016 at 03:54 PM.
ThnkFrst is online now  
Old 08-24-2016, 02:07 AM   #12
Senior Member
 
Join Date: Feb 2013
Location: GA
Posts: 217
About where the main smiley is.
kennethk is online now  
Old 01-25-2017, 05:11 AM   #13
Senior Member
 
Join Date: Feb 2013
Location: GA
Posts: 217
Sig said I can send it in free of charge and they will try to figure it out. The plan is to send it back with one of my MCX BCG's that must get swapped under the recall.
kennethk is online now  
Old 01-25-2017, 05:20 AM   #14
Senior Member
 
ThnkFrst's Avatar
 
Join Date: Mar 2012
Location: SEMI
Posts: 7,758
Sounds like a good plan.
ThnkFrst is online now  
Old 02-10-2017, 09:30 AM   #15
Senior Member
 
Join Date: Feb 2013
Location: GA
Posts: 217
Got my P227 back yesterday. No parts were replaced. Note said they fit the barrel to the gun. The only shinny metal I saw was where the barrel goes thru the end of the slide so I think they opened up the angle of the hole a little. Turn around time was ~1.5 weeks. Thanks Sig!
Willard likes this.
kennethk is online now  
Reply

  SIG Talk > SIG Sauer Forum > SIG Sauer Gunsmithing


Search tags for this page

p227 threaded barrel

,

sig 227 threaded barrel

Click on a term to search for related topics.

Thread Tools
Display Modes


Similar SIG Talk Discussions
Thread Thread Starter Forum Replies Last Post
Threaded barrels for 9mm p220? rhr1960 SIG Sauer Gunsmithing 7 07-23-2016 02:15 PM
Sig P220-10 10mm Bar-Sto Match Target Barrel Fit - PART 2 was1911 Gun Projects 1 07-09-2016 08:55 AM
Sig P220-10 10mm Bar-Sto Match Target Barrel Fit - PART 1 was1911 Gun Projects 1 07-09-2016 07:47 AM
Need advice...Barsto Barrel fitting for P229 Legion Beefstews SIG Sauer Gunsmithing 17 07-08-2016 12:22 PM
Question about a threaded barrel on the P938 Talldog P238, P938 Pistol 1 06-29-2016 04:19 PM


Top Gun Sites Top Sites List

Powered by vBulletin 3.8.7
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
SEO by vBSEO 3.6.1
Copyright © 2010 - 2017 SIG Talk. All rights reserved.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.SIG Talk is a SIG Sauer Firearms enthusiast's forum, but it is in no way affiliated with, nor does it represent SIG Sauer, Inc. of Exeter, NH.