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M1A/M1 Trigger modifications-Beware..

This is a discussion on M1A/M1 Trigger modifications-Beware.. within the Art Luppino forums, part of the Gun Professionals category; Most M1A's and M1's, as issued, had what can be described as an awful triggers pull, this can be improved upon with a good stone ...


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Old January 10th, 2017, 10:07 AM   #1
Lifer
 
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M1A/M1 Trigger modifications-Beware..

Most M1A's and M1's, as issued, had what can be described as an awful triggers pull, this can be improved upon with a good stone and a little oil for it.

This is not a "How to" thread, be rather a warning about modifing the hammer hooks.

If you plan, and most people can do the work, to improve your trigger by stoneing the hammer hooks be certain you know the difference between which are the front hooks and which are the rear hooks before you start.

Never allow anybody to mess with the front hooks that is not experienced. These hooks must remain even or you will have a real problem your hands... Many hammers have ruined messing with wrong hooks along with more rounds going off than you intended..

Art

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Old January 10th, 2017, 05:24 PM   #2
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I completely agree with Art, don't mess with the front hooks, or with what I call the 'sear lugs' near the middle of the trigger. The angles and edges on those guys are quite picky. I wouldn't even try to 'smooth' or 'polish' them - they're probably fine as-is anyway.

With the hammer fully cocked and trigger fully forward, the REAR hooks are the ones nearer to the rear of the rifle, and very close to the triangle gizmo at the top of the trigger. The FRONT hooks are the other ones - and they are in contact with the 'sear lugs' near the middle of the trigger.

The rear hooks do 2 functions -
1) They get 'caught' underneath the triangle gizmo and function as the 'disconnector' to prevent the hammer from falling when the bolt goes forward.
2) They determine the length of trigger movement during the 1st stage of trigger pull. And that movement determines how much actual 2nd stage 'sear engagement' remains before the hammer is released.
The 2nd stage BEGINS when the triangle gizmo touches the rear hooks, because the spring action of the gizmo adds addition weight to the trigger pull.

The front hooks also do 2 functions -
1) With the hammer ALL the back and the rear hooks UNDER the tri-giz, as the trigger is allowed to move slightly forward the giz releases the rear hooks, and the hammer MUST BE Caught by the sear lugs and the front hooks - that's called the 'hand-off' from the rear hooks to the front hooks.
When you slowly allow the trigger to move forward, you can hear and feel the click. Don't try to 'hold' the trigger in that position - let it move fully forward for the next shot.
2) The front hooks provide the total sear engagement that holds the hammer in 'cocked' position. With the trigger fully forward there is full sear engagement. As the trigger is moved thru the 1st stage the sear engagement decreases until there is only a small amount remaining at the beginning of the 2nd stage.
NOTE that the movement during the 1st stage is NOT 'take-up' or 'slack' - it is fully functional sear engagement reduction.

Jay Kosta
Endwell NY USA

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Old January 11th, 2017, 09:47 AM   #3
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Although I wouldn't ever consider altering the sear engagement [front hooks/trigger] to any degree in terms of angle or pitch, a flat parallelogram shaped hard Arkansas stone makes it a snap to remove the parkerization and mirror polish the surfaces without removing the surface hardness (that would be real BAD). I would strongly recommend against any stone that is more abrasive, and keep in mind that in this case "very SLOW is fast enough!"

[Stone should be on a bench edge or other surface, NOT in HAND.... apply sear surfaces to stone by hand using care not to tilt/pitch in any direction. It is very easy to feel the proper trigger surface alignment on the stone, not so much with the hammer...use more care/caution.

A well used hammer/trigger pair that's still in spec often sports this treatment by virtue of "lots 'o trigger-time".

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