AIA Mk4 Match trigger

Seems like a lot of cash for a decent trigger pull on a rifle that is as easy to work on as a Lee pattern bolt action. Your rifle is closest to a No4 MkII (many of the basic parts of your AIA are identical to military Lee-Enfield parts so it should fit perfectly) .
 
Here's something tangential to the discussion about trigger pull that may be helpful, but it's specifically related to an original real No.4 Enfield.

With thanks to Advisory Panel member Peter Laidler, there's an article on triggers presented in two parts which can be found in the Technical Articles for Milsurp Collectors and Re-loaders (click here)http://www.milsurps.com/forumdisplay.php?f=25.

"The Trigger Pull-Off" - Part 1 (By Peter Laidler) (click here)http://www.milsurps.com/showthread.php?t=4319

"The Trigger Pull-Off" - Part 2 (By Peter Laidler) (click here)http://www.milsurps.com/showthread.php?t=4320

It's accompanied by a detailed photo montage of a previously damaged skeletonised No.4(T) rifle, used as a training piece for budding Armourers to learn with and develop their skills. As Peter says "It appeared that this ‘rifle’ had never been finished as a ‘T’ as the front pad hole had not been drilled. During bead blasting after a hard life as a skeletonised rifle, it was established that the screw had sheared off and simply been made off level. Drilled out and extracted, it’s back to its former self. Waste not, want not as they say…". Other photos in the article show the clear interaction of the sear, cocking piece and trigger during various phases of its operation.

Article Extract .....

Pictorially, this shows the trigger at the end of the first pull, both ribs touching the trigger bent or flat of the sear with the sear nose at the extreme edge of the cocking piece………, just ready for the off.


(Click PIC to Enlarge)

Regards,
Badger
 
You do not need an after market trigger when the existing trigger can be adjusted to be slicker than snot on a door knob. ;)

triggersear.jpg


As you can see above the first stage trigger pull brings the sear to the edge of the cocking piece bent. The second stage trigger pull pushes the sear off the edge of the cocking piece and the rifle fires.

Where the sear stops on the cocking piece (sear engagement) at the end of first stage pull determines how hard and long the second stage trigger pull will be. (the closer to the edge the better)

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trigger-4a.jpg


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The angle of my cocking piece bent is set at 15 degrees on my favorite shooter. (slicker than snot on a door knob) :D

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