M14 Gas cylinder plug question - M14 Forum

M14 Forum


M14 Gas cylinder plug question

This is a discussion on M14 Gas cylinder plug question within the The M14 forums, part of the M14 M1A Forum category; Are USGI Gas cylinder plugs stainless steel as well and can the spindle valve be parkerized ? Thank you...


Go Back   M14 Forum > M14 M1A Forum > The M14

18Thanks
  • 1 Post By Wasted ammo
  • 3 Post By Ted Brown
  • 1 Post By KurtC
  • 2 Post By Buelligan
  • 2 Post By Eagle7840
  • 2 Post By M1A's r BEST
  • 5 Post By Jeff42899
  • 1 Post By Phil McGrath
  • 1 Post By M1A's r BEST
Reply
 
LinkBack Moderator Tools Display Modes

Old May 15th, 2017, 02:16 PM   #1
Grunt
 
elvis3006's Avatar
 
Join Date: Jun 2012
Location: Canada
Posts: 110
M14 Gas cylinder plug question

Are USGI Gas cylinder plugs stainless steel as well and can the spindle valve be parkerized ? Thank you


Last edited by elvis3006; May 15th, 2017 at 02:49 PM.
elvis3006 is offline  
Remove Ads
Old May 15th, 2017, 03:46 PM   #2
Lifer
 
Wasted ammo's Avatar
 
Join Date: Dec 2016
Location: GA
Posts: 3,235
I don't think they are SS. I obviously was wrong!

Thanks from elvis3006

Last edited by Wasted ammo; May 16th, 2017 at 04:33 PM.
Wasted ammo is offline  
Old May 16th, 2017, 09:30 AM   #3
Dodgin' The Reaper
 
Ted Brown's Avatar
 
Join Date: May 2004
Location: Jacksonville, OR
Posts: 5,472

Awards Showcase

US M14 gas plugs are SS.

Thanks from M14vrp, RDS and elvis3006
Ted Brown is offline  
 
Old May 16th, 2017, 09:46 AM   #4
Lifer
 
Join Date: Oct 2008
Location: NJ
Posts: 4,951

Awards Showcase

I believe the original specs called for a stainless steel piston, gas cylinder, spindle valve and gas plug. The reasoning was that carbon attracts moisture, moisture promotes corrosion.

I would have made stainless steel Flash Hiders as well.

Thanks from elvis3006
KurtC is offline  
Old May 16th, 2017, 09:49 AM   #5
Lifer
 
Buelligan's Avatar
 
Join Date: Dec 2008
Location: Georgia
Posts: 4,733
Quote:
Originally Posted by Ted Brown View Post
US M14 gas plugs are SS.
That would explain how some gas plugs get so tight after they're installed. The threads must be slightly galling against the SS gas cylinder threads.

Thanks from Douglas Haig and elvis3006
Buelligan is offline  
Old May 16th, 2017, 04:32 PM   #6
Platoon Commander
 
Eagle7840's Avatar
 
Join Date: Jan 2016
Location: Inver Grove Hgts, Minnesota
Posts: 423
Quote:
Originally Posted by Buelligan View Post
That would explain how some gas plugs get so tight after they're installed. The threads must be slightly galling against the SS gas cylinder threads.
That's why I and others recommend using anti-seize on gas plug threads from the get go before going to the range. Makes life so much easier afterwards.

Thanks from ConRich and elvis3006
Eagle7840 is offline  
Old May 17th, 2017, 04:01 AM   #7
Lifer
 
Join Date: Oct 2006
Location: Chesterfield, VA
Posts: 3,748
If they (SA) did it right, the gas plug and cylinder are made from different grades of stainless steel.

If similar grades of stainless steel are used then galling can be a real issue. Using different grades should take care of this.

S&W screwed this up in the 60's when they introduced the stainless steel revolvers. They fixed it by using industrial chromed hammers and triggers in their stainless steel guns once they figured out what was going on. Ruger, on the other hand, understood (or learned from S&W) and when they introduced their stainless steel revolvers they used different grades of stainless steel and didn't have galling issues.

I've personally handled, tore down and did my best, to repair a S&W M64 that had galling between the cylinder and the crane so bad you could barely turn the cylinder. The gun wouldn't fire DA at all (when you can't get the hammer to cock and the cylinder to turn when pulling the trigger with both trigger fingers at the same time - you are in deep doodoo). I'll also admit the officer carrying that particular S&W wasn't know for taking care of anything but insuring he got the easy assignments, his share of cokes and chips, etc., etc. so it probably didn't get a lot of lube either.

Thanks from elvis3006 and Dougboffl
M1A's r BEST is offline  
Old May 17th, 2017, 04:43 AM   #8
Scout Sniper
 
Jeff42899's Avatar
 
Join Date: Oct 2013
Location: Ohio, USA
Posts: 708

Awards Showcase

The plug & cylinder are both 416
The piston is 420, the lock is 4150 and the spindle valve is 440.
It may be sacrilege, but we nitride the plug and the piston for the very reasons stated above. We also nitride our cast gas cylinder but black oxide the forged version.

Jeff42899 is offline  
Old May 17th, 2017, 05:11 AM   #9
Super Moderator
 
Phil McGrath's Avatar
 
Join Date: May 2004
Location: Silverdale, WA.
Posts: 7,548

Awards Showcase

Quote:
Originally Posted by M1A's r BEST View Post
S&W screwed this up in the 60's when they introduced the stainless steel revolvers. They fixed it by using industrial chromed hammers and triggers in their stainless steel guns once they figured out what was going on. Ruger, on the other hand, understood (or learned from S&W) and when they introduced their stainless steel revolvers they used different grades of stainless steel and didn't have galling issues.
Funny you should bring this up, in the 1911 world Randal was the first too bring a all SS 1911 to market, and they had issues with galling until they figured it out. Colt and SA learned from Randal's mistake so they didn't repeat it.

But the legend still hasn't died, all SS 1911's need too be loosely fitted and run with a ton of lube or they will gall up and choke.

Thanks from elvis3006
Phil McGrath is offline  
Old May 17th, 2017, 01:06 PM   #10
Lifer
 
Join Date: Oct 2006
Location: Chesterfield, VA
Posts: 3,748
Before I retired I worked at a place that made a type of "plastic" and formed it into a product for sale to other companies for various things they made from it.

We had some pretty large filter housings we used across the plant (different sizes/types depending on the age of the production unit). The parts for those filter housings were made of different grades of stainless steel. They found out long ago that if a nut and mandrel were made from the same grade you'd break the end of the mandrel off getting the nut off it after being at 550F (or higher) for a month or two.

One time, an area of the plant decided they would bypass us (I was in the filter shop at the time) and order their own filter units. Instead of talking to me first, they talked to an "outside consultant who were experts on such matters". Guess what? They ordered parts made from the wrong grade of stainless steels and within a matter of 3 or 4 years 6 of the (very) high dollar stainless steel filter units they purchased were damaged beyond repair and they had to resort to using the old ones (at that time around 30 years old and still going strong) and still in use now approaching 45 years of age.

Do it right or it'll catch up with you.

I wonder if the GI M14's used the same grade of stainless for the cylinders and plugs?

Thanks from elvis3006
M1A's r BEST is offline  
Reply

  M14 Forum > M14 M1A Forum > The M14

Moderator Tools
Display Modes


Similar M14 Forum Discussions
Thread Thread Starter Forum Replies Last Post
Gas Cylinder Plug / Gas Cylinder Question RealtorEHS The M14 7 September 12th, 2016 05:32 PM
You have to read this ribs55 Steel and Wood 11 February 4th, 2015 07:15 PM
Garand Gas Cylinder Lock Torque (Tightness) Question LbSigMan Steel and Wood 7 June 24th, 2010 07:23 PM
Question about unitized gas cylinder (welded) gas_gunner Accuracy 10 July 5th, 2009 11:33 PM



Top Gun Sites Top Sites List