M1A Short Stroking - M14 Forum

M14 Forum


M1A Short Stroking

This is a discussion on M1A Short Stroking within the Gunsmithing forums, part of the M14 M1A Forum category; New to forum, hello there and Happy New Year. Any ideas welcome. I have an older Springfield Armory NM M1A, has worked great up to ...


Go Back   M14 Forum > M14 M1A Forum > Gunsmithing

1Thanks
Reply
 
LinkBack Moderator Tools Display Modes

Old January 3rd, 2017, 01:01 AM   #1
Newbie
 
Join Date: Jan 2017
Location: Heartland of America
Posts: 5
M1A Short Stroking

New to forum, hello there and Happy New Year. Any ideas welcome.

I have an older Springfield Armory NM M1A, has worked great up to now. Stored in safe for a year. Took to range last week, will not feed, will not lock bolt to rear. I now have a manually operated rifle. Gas screw is in preset vertical condition from factory for the NM rifle, I have not messed with it ever. Lubricated prior to shooting per mil specs with good quality lube.

Tried all magazines, mostly USGI in very good condition, same issue with multiple mags.

Gas cylinder, gas plug, gas piston are clean inside and out, never lubed. Chamber and barrel are clean. Gas plug is tight. Tried Aussie ADI 7.62, South African 7.62, and FNM 7.62 surplus, and reloaded 168 gr FMJBT over 41.5 gr of IMR 4895 in LC case loaded to specs. Same exact problem with each type of ammo.

Gun Surfer is offline  
Remove Ads
Old January 3rd, 2017, 07:22 AM   #2
Lifer
 
Join Date: Oct 2008
Location: NJ
Posts: 4,467

Awards Showcase

Function test.

Can you manually feed and extract a magazine full of ammunition? Does the bolt lock back after the last cartridge?

KurtC is offline  
Old January 3rd, 2017, 07:36 AM   #3
Old Salt
 
POLACK's Avatar
 
Join Date: Aug 2016
Location: south east Florida
Posts: 1,555
tony ben tilt test video
check and make sure no obstruction has crawled into the gas port in the gas system.
if all above is good,contact sa and see if under warranty

POLACK is online now  
 
Old January 3rd, 2017, 08:06 AM   #4
Lifer
 
Dougboffl's Avatar
 
Join Date: Nov 2013
Location: Sonshine State, JC
Posts: 2,141
Welcome from Florida.

Sorry bout your gun troubles.

+1 on what KurtC says

Dougboffl is online now  
Old January 3rd, 2017, 08:11 AM   #5
Dodgin' The Reaper
 
nf1e's Avatar
 
Join Date: Aug 2009
Location: New Preston,CT
Posts: 6,344
Welcome from CT.

nf1e is online now  
Old January 3rd, 2017, 08:13 AM   #6
Lifer
 
Capona's Avatar
 
Join Date: Jul 2013
Location: Illinois
Posts: 2,605
Welcome from IL.

Capona is offline  
Old January 3rd, 2017, 08:53 AM   #7
Lifer
 
JayKosta's Avatar
 
Join Date: Mar 2009
Location: Endwell NY
Posts: 2,044
Check the alignment of the gas port in the barrel and the opening in the gas cylinder.

Jay Kosta
Endwell NY USA

JayKosta is offline  
Old January 3rd, 2017, 06:27 PM   #8
Newbie
 
Join Date: Jan 2017
Location: Heartland of America
Posts: 5
Hi there, yes the rifle functions manually. No the bolt will not lock back after the last round has been fired, by itself. If I pull the bolt back far enough by hand, yes it will lock back. The rifle passes the tilt test fine.

(Thanks also to the moderator for dealing with my double post. I did not see the banner first timestating the the post to be screened, so I thought I needed to post again.)

I will try to check the ports aligning. I feel like that may be it, or there may be an obstruction, but if obstructed it could only be the gas port into the barrel from what I can tell, other openings are clear. Anyway will go over the gas system and barrel to the best of my ability.

Thanks for now, stay tuned.

Gun Surfer is offline  
Old January 3rd, 2017, 07:13 PM   #9
Lifer
 
Join Date: Oct 2008
Location: NJ
Posts: 4,467

Awards Showcase

If it loads and extracts manually, then nothing is broken.

Now lock the bolt back to the rear. Hold the rifle muzzle up so that piston slides rearward. Shine a bright light down the muzzle and look into the relief port on the underside of the gas cylinder. The light in the barrel should appear round.

If it doesn't, then your port is partially blocked. Either dirt or misalignment.

KurtC is offline  
Old January 3rd, 2017, 07:40 PM   #10
Old Salt
 
JEFFJP_N_JJ's Avatar
 
Join Date: Mar 2016
Location: California, USA?
Posts: 1,482
welcome from the So CA desert

JEFFJP_N_JJ is offline  
Old January 4th, 2017, 12:27 AM   #11
Newbie
 
Join Date: Jan 2017
Location: Heartland of America
Posts: 5
Quote:
Originally Posted by KurtC View Post
If it loads and extracts manually, then nothing is broken.

Now lock the bolt back to the rear. Hold the rifle muzzle up so that piston slides rearward. Shine a bright light down the muzzle and look into the relief port on the underside of the gas cylinder. The light in the barrel should appear round.

If it doesn't, then your port is partially blocked. Either dirt or misalignment.
No light shows when looking into relief port. The hole in top of gas cylinder is perfectly round. But above that looking into where the spindle valve is, from what little I can see, the "hole" looks almost elliptical in shape with something shiny on the forward end, maybe part of valve blocking access? What could be misaligned?

Gun Surfer is offline  
Old January 4th, 2017, 08:00 AM   #12
Lifer
 
Join Date: Oct 2008
Location: NJ
Posts: 4,467

Awards Showcase

Quote:
Originally Posted by Gun Surfer View Post
No light shows when looking into relief port. The hole in top of gas cylinder is perfectly round. But above that looking into where the spindle valve is, from what little I can see, the "hole" looks almost elliptical in shape with something shiny on the forward end, maybe part of valve blocking access? What could be misaligned?
Do you see the light in the barrel? It will be smaller than the relief port, but is should be round.

If the gas cylinder is too far forward, it could cover part of the barrel port.

KurtC is offline  
Old January 4th, 2017, 08:04 AM   #13
Lifer
 
Capona's Avatar
 
Join Date: Jul 2013
Location: Illinois
Posts: 2,605
Quote:
Originally Posted by Gun Surfer View Post
No light shows when looking into relief port. The hole in top of gas cylinder is perfectly round. But above that looking into where the spindle valve is, from what little I can see, the "hole" looks almost elliptical in shape with something shiny on the forward end, maybe part of valve blocking access? What could be misaligned?
A small Allen shot be able to slip through and be seen in the barrel.

Capona is offline  
Old January 4th, 2017, 05:00 PM   #14
Newbie
 
Join Date: Jan 2017
Location: Heartland of America
Posts: 5
Response to last two posts, no light shows through from relief port into barrel. No light shows either direction.

A large size paper clip will pass through to top of barrel. A small allen wrench, like 0.062" will not pass through, seems to be hitting something very solid in the gas assembly / valve chamber. A pipe cleaner will not pass through. Paper clip is approx 1/2 diameter of the allen wrench.

Being a NM rifle, I have never had the gas cylinder off. I assume its somehow unitized with the front barrel band. Never have adjusted the gas screw, again told not to when its a NM rifle.

I would like to try and clear this up myself, but don't want to go Bubba and damage something. Do not have a gunsmith in my area who is both qualified and willing to do this type of work. We have some high tech nationally known gunsmiths in my area, but they do high end builds for high rollers.

Thanks for sticking with me so far guys!

Gun Surfer is offline  
Old January 4th, 2017, 05:18 PM   #15
Old Salt
 
Wasted ammo's Avatar
 
Join Date: Dec 2016
Location: GA
Posts: 1,369
Don't send it anywhere bubba'ed up. Someone will give you some sound advise other than mine.glad to here someone actually admit they don't want to shade tree it!

Wasted ammo is offline  
Reply

  M14 Forum > M14 M1A Forum > Gunsmithing

Moderator Tools
Display Modes


Similar M14 Forum Discussions
Thread Thread Starter Forum Replies Last Post
Short stroking ShovelheadDan Gunsmithing 5 January 8th, 2012 03:00 AM
M14 EBR wanted as first rifle, help/advice needed M3rc Nate Modern M14 115 December 14th, 2011 09:59 AM
Want To Buy: M1A stock with short LOP crosse PX 1 November 3rd, 2011 09:43 PM
Ruger 10/22 vs M1A 105GunGrunt Accuracy 16 August 12th, 2010 01:09 AM
Should I get another M1A? Gas-Operated The M14 20 September 29th, 2007 06:30 PM



Top Gun Sites Top Sites List