Any of you guys use it such as when firing suppressed? Someone told me once not to touch it on a match gun and as such had largely forgotten it was there, but it seems like it would be a very handy device. Any issues I should be aware of here? Any problems with case extraction?
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M1A Gas spindle valve
- Thread starter BattleAxe
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Re: M1A Gas spindle valve
I was told that if you open it so the gas system will not function it will harm the rifle. I do not know if it is true but after taking the time to properly accurize my rifle and bed it in a McMillan stock with a Heavy Kreiger I didn't want to experiment.
I was told that if you open it so the gas system will not function it will harm the rifle. I do not know if it is true but after taking the time to properly accurize my rifle and bed it in a McMillan stock with a Heavy Kreiger I didn't want to experiment.
G
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Re: M1A Gas spindle valve
Do not turn the gas off, unless your launching grenades or shooting a line throwing device.
Most all M14's or M1A's I've turned the gas off, will lock the bolt up until the weapon cools or you kick the op rod with you boot. If you get to shooting subsonic ammo threw a can, yes you then can turn it off.
Many a XM21 was turned on an off, when subsonic ammo was used, but that was the only time, (save, line and grenades).
Do not turn the gas off, unless your launching grenades or shooting a line throwing device.
Most all M14's or M1A's I've turned the gas off, will lock the bolt up until the weapon cools or you kick the op rod with you boot. If you get to shooting subsonic ammo threw a can, yes you then can turn it off.
Many a XM21 was turned on an off, when subsonic ammo was used, but that was the only time, (save, line and grenades).
Re: M1A Gas spindle valve
If I'm not mistaken the gas valve on the Match M1A's are pinned and can't be turned. At least it is on mine which is a Devine TX one. Don't know about GI M 21's
If I'm not mistaken the gas valve on the Match M1A's are pinned and can't be turned. At least it is on mine which is a Devine TX one. Don't know about GI M 21's
Re: M1A Gas spindle valve
M21s and AMU National Match M14s had the gas cutoff epoxied in the "Open" position.
M21s and AMU National Match M14s had the gas cutoff epoxied in the "Open" position.
Re: M1A Gas spindle valve
If you're shooting a M14 type rifle with a suppressor but it doesn't have a scope mount over the receiver, you can use the M3 breech shield to deflect the blowback. I've tried this. It works well.
If you're shooting a M14 type rifle with a suppressor but it doesn't have a scope mount over the receiver, you can use the M3 breech shield to deflect the blowback. I've tried this. It works well.
Re: M1A Gas spindle valve
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Different</div><div class="ubbcode-body">If you're shooting a M14 type rifle with a suppressor but it doesn't have a scope mount over the receiver, you can use the M3 breech shield to deflect the blowback.
I've tried this. It works well. </div></div>
Agreed.
<span style="font-weight: bold">M3</span> on the right.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Different</div><div class="ubbcode-body">If you're shooting a M14 type rifle with a suppressor but it doesn't have a scope mount over the receiver, you can use the M3 breech shield to deflect the blowback.
I've tried this. It works well. </div></div>
Agreed.
<span style="font-weight: bold">M3</span> on the right.
Re: M1A Gas spindle valve
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">If I'm not mistaken the gas valve on the Match M1A's are pinned and can't be turned. At least it is on mine which is a Devine TX one. Don't know about GI M 21's</div></div>
Santo, that's the way they are suppose to be. M-21s are NM Rifles, they have the gas valve locked where they can't be turned. They were that way on all the M-21s at the AMU Sniper School, and the M-21 systems my state (NG)were. I have the manuel for building NMs from M-14s and it covers locking the gas valve. I've seen a lot of M-21s and NM M-14s and I never saw one that wasn't locked.
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">If I'm not mistaken the gas valve on the Match M1A's are pinned and can't be turned. At least it is on mine which is a Devine TX one. Don't know about GI M 21's</div></div>
Santo, that's the way they are suppose to be. M-21s are NM Rifles, they have the gas valve locked where they can't be turned. They were that way on all the M-21s at the AMU Sniper School, and the M-21 systems my state (NG)were. I have the manuel for building NMs from M-14s and it covers locking the gas valve. I've seen a lot of M-21s and NM M-14s and I never saw one that wasn't locked.
Re: M1A Gas spindle valve
I was aware that they were supposed to be pinned on the commerical M1A match rifles I just wasn't sure about the M21 since I never handled one although I was pretty sure they would be pinned as well. Thanks for the feedback.
I was aware that they were supposed to be pinned on the commerical M1A match rifles I just wasn't sure about the M21 since I never handled one although I was pretty sure they would be pinned as well. Thanks for the feedback.
Re: M1A Gas spindle valve
..
Some can providers will custom machine a spindle to allow for the use of the switch as the means to properly provide for suppressor function. The process begins with the host being sent in. The result is as good as it can get for this action.
..
..
Some can providers will custom machine a spindle to allow for the use of the switch as the means to properly provide for suppressor function. The process begins with the host being sent in. The result is as good as it can get for this action.
..
Re: M1A Gas spindle valve
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: RollingThunder51</div><div class="ubbcode-body">
The result is as good as it can get for this action.
</div></div>
What is the result?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: RollingThunder51</div><div class="ubbcode-body">
The result is as good as it can get for this action.
</div></div>
What is the result?
Re: M1A Gas spindle valve
..
That which you already are very much aware of. Mechanically, the action creates a good deal of mechanical noise. What is accomplished is flawless cycling, appropriate gas pressure and safe bolt function. The ability to remove the can and return to proper un-supressed function. All of that while maintaining excellent accuracy.
The spindle work accounts for the relative sensitive balance between action reliability and safety when suppressed. As an example, a properly prepared spindle was provided for a customer provided host, when the owner received the unit, he chopped the barrel back only to find the accuracy and cycling suffered <span style="font-weight: bold">when suppressed</span>. A new spindle was required, provided and the issue was resolved. The new can is 100% titanium, weighs about 15 oz and is quieter than.....right...the action.
..
That which you already are very much aware of. Mechanically, the action creates a good deal of mechanical noise. What is accomplished is flawless cycling, appropriate gas pressure and safe bolt function. The ability to remove the can and return to proper un-supressed function. All of that while maintaining excellent accuracy.
The spindle work accounts for the relative sensitive balance between action reliability and safety when suppressed. As an example, a properly prepared spindle was provided for a customer provided host, when the owner received the unit, he chopped the barrel back only to find the accuracy and cycling suffered <span style="font-weight: bold">when suppressed</span>. A new spindle was required, provided and the issue was resolved. The new can is 100% titanium, weighs about 15 oz and is quieter than.....right...the action.
Re: M1A Gas spindle valve
Well, I currently enjoy flawless cycling, appropriate gas pressure and safe bolt
function plus the ability to remove the can and return to proper un-suppressed function.
Will the modified spindle you speak of cycle sub sonic ammo?
Well, I currently enjoy flawless cycling, appropriate gas pressure and safe bolt
function plus the ability to remove the can and return to proper un-suppressed function.
Will the modified spindle you speak of cycle sub sonic ammo?
Re: M1A Gas spindle valve
The gas spindles on the earlier M21's and National MAtch Rifles were not epoxied opened but rather the process of unitizing the front ferral and the gas tube was to drill though the ferral into the gas cylinder and finally into the gas spindle. The spindle was then tapped and two nylock screws were used to lock the ferral, gas cylinder and spindle together making the gas system unitized and more accurate.
Later the units were simply tig welded (AMU) across the top and bottom of the gas cylinder. These units the spindle will rotate.
I have fired the rifle with the spindle closed. I never had any problem with it.
The gas spindles on the earlier M21's and National MAtch Rifles were not epoxied opened but rather the process of unitizing the front ferral and the gas tube was to drill though the ferral into the gas cylinder and finally into the gas spindle. The spindle was then tapped and two nylock screws were used to lock the ferral, gas cylinder and spindle together making the gas system unitized and more accurate.
Later the units were simply tig welded (AMU) across the top and bottom of the gas cylinder. These units the spindle will rotate.
I have fired the rifle with the spindle closed. I never had any problem with it.
Re: M1A Gas spindle valve
H20, most think they have safe pressures, most think their bolts are not slamming. Most confuse always cycling with safe cycling. Not saying you aren't, not at all. But, it takes more than a spoonful to get it right with cans on M1a. On this host, back pressure can wreck the extractor. With a tuned spindle set (can/spindle) the tuning is based on back pressure testing. Can off? Just rotate to norm.
Subs? Probably not, if it is cycling on yours, well there you go..excess pressure..enough to cycle on subs..ng. Can be tuned for JUST subs and can off but not sub, normal suppressed, no suppressor.
I too have had no issue shutting off the gas. On the FN FAL as well. There the gas port is welded and drilled to .06 or .07 to be "in range" for the normal adjuster tuning.
H20, most think they have safe pressures, most think their bolts are not slamming. Most confuse always cycling with safe cycling. Not saying you aren't, not at all. But, it takes more than a spoonful to get it right with cans on M1a. On this host, back pressure can wreck the extractor. With a tuned spindle set (can/spindle) the tuning is based on back pressure testing. Can off? Just rotate to norm.
Subs? Probably not, if it is cycling on yours, well there you go..excess pressure..enough to cycle on subs..ng. Can be tuned for JUST subs and can off but not sub, normal suppressed, no suppressor.
I too have had no issue shutting off the gas. On the FN FAL as well. There the gas port is welded and drilled to .06 or .07 to be "in range" for the normal adjuster tuning.
Re: M1A Gas spindle valve
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: M25BeastShooter</div><div class="ubbcode-body">The gas spindles on the earlier M21's and National MAtch Rifles were not epoxied opened but rather the process of unitizing the front ferral and the gas tube was to drill though the ferral into the gas cylinder and finally into the gas spindle. The spindle was then tapped and two nylock screws were used to lock the ferral, gas cylinder and spindle together making the gas system unitized and more accurate.
Later the units were simply tig welded (AMU) across the top and bottom of the gas cylinder. These units the spindle will rotate.
I have fired the rifle with the spindle closed. I never had any problem with it. </div></div>
Correct except The marine corp is the one that came up with welding them. The "screw and glue method" is the AMTU method.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: M25BeastShooter</div><div class="ubbcode-body">The gas spindles on the earlier M21's and National MAtch Rifles were not epoxied opened but rather the process of unitizing the front ferral and the gas tube was to drill though the ferral into the gas cylinder and finally into the gas spindle. The spindle was then tapped and two nylock screws were used to lock the ferral, gas cylinder and spindle together making the gas system unitized and more accurate.
Later the units were simply tig welded (AMU) across the top and bottom of the gas cylinder. These units the spindle will rotate.
I have fired the rifle with the spindle closed. I never had any problem with it. </div></div>
Correct except The marine corp is the one that came up with welding them. The "screw and glue method" is the AMTU method.
Re: M1A Gas spindle valve
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: RollingThunder51</div><div class="ubbcode-body">
Subs? Probably not, if it is cycling on yours, well there you go..excess pressure..enough to cycle on subs..ng.
</div></div>
Roll, I've never had an M14 that cycled subs and that's a good thing because factory sub-sonic ammo is expensive
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">
...most think they have safe pressures, most think their bolts are not slamming. Most confuse always cycling with safe cycling.</div></div>
Yeah, I'm glad I don't have to be concerned with any of those issues.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: RollingThunder51</div><div class="ubbcode-body">
Subs? Probably not, if it is cycling on yours, well there you go..excess pressure..enough to cycle on subs..ng.
</div></div>
Roll, I've never had an M14 that cycled subs and that's a good thing because factory sub-sonic ammo is expensive
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">
...most think they have safe pressures, most think their bolts are not slamming. Most confuse always cycling with safe cycling.</div></div>
Yeah, I'm glad I don't have to be concerned with any of those issues.
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