The Firing Line Forums

Go Back   The Firing Line Forums > The Skunkworks > The Smithy

Thread Tools Search this Thread
Old July 9, 2010, 07:45 AM   #1
Junior Member
Join Date: July 9, 2010
Location: New Jersey
Posts: 4
Colt 1911 Specs. questions*NEED HELP*

I have a few questions on 1911 specs. I am hoping someone can help me with.

1) How much spring out should the extractor have? Between .005 and .010, between .015 and .025 Between .025 and .035

2)How much pressure should it take to push a cartridge into firing position with the extractor correctly held in place? 1lb., 4.5lbs., 6 lbs. or 8?

3) What is the maximum amount of loose breech a 1911 pistol can have before it must be repaired? .012,.008,.010
I would really appreciate any help, I just can't find these specs. anywhere. THANKS!
copabeat is offline  
Old July 9, 2010, 09:32 AM   #2
Join Date: March 4, 2005
Location: Ohio
Posts: 13,831
Welcome to the forum.

An empty case held in the extractor should be able to dangle or nod slightly forward without falling free. Slight shaking back and forth should not dislodge it. It should not, however, be held in a death grip that keeps the case ridged. In other words, the hook bears against the case rim, but not hard enough to lock the case in position. The tip of the hook should not touch down in the extractor groove.

I don't know of a pounds force insertion spec, per se? You'd have to use a platform scale to measure that. Doing it by feel from experience requires you start with a good example to judge from. The only measuring tool I am aware of is a gauge Brownells sells which consists of a case-rim-diameter tab with a hole in the bottom for a trigger weight scale or a dangling weight (your choice) and it has a range of acceptable withdrawal weights in ounces that it should fall within when you pull it free of the extractor. Kuhnhausen does say that around 3 1/2 to 4 1/2 lbs of extractor pressure should bear against the rim of the case for hardball, but not to exceed 4 lb for light wadcutter loads. Unfortunately he neglects to illustrate how he sets up to measure this? I would say it takes half to three quarters of a pound or so pressure to push a round down out of a properly fitted extractor. Not a lot. The lighter end of the range assumes the extractor hook is fitted and polished inside and the brass is new and smooth.

I don't know what you mean by loose breech? If it is the gap between the barrel extension (hood) at the top back end of the barrel and the channel it rides in above the breech or recoil face, it is normal for those only to be tight with a fitted barrel for match accuracy that started with extra length in the hood for the gunsmith to file down to a fit. It is normal for them to have about 0.002" gap all around in the channel in the slide above the recoil face when you finish such a barrel. I've never seen that aspect of a fitting job truly wear out, though I suppose if you shot a gun a lot in sandy desert or other abrasive conditions, it would happen. The fellows living in the southwest could tell you. A GI barrel, on the other hand, can have a substantial gap there, as precision in the lock-up isn't needed to meet military accuracy specs.

I suggest you get a copies of Jerry Kuhnhausen's Shop Manuals on the 1911. They have the critical dimensions and inspection criteria all neatly laid out, and other than a couple of spots, like the measurement I just mentioned, is pretty clear.
Gunsite Orange Hat Family Member
CMP Certified GSM Master Instructor
NRA Certified Rifle Instructor
NRA Benefactor Member

Last edited by Unclenick; July 9, 2010 at 10:34 AM.
Unclenick is offline  

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT -5. The time now is 05:21 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
This site and contents, including all posts, Copyright © 1998-2017 S.W.A.T. Magazine
Copyright Complaints: Please direct DMCA Takedown Notices to the registered agent:
Contact Us
Page generated in 0.04569 seconds with 7 queries