AT trigger pre and over travel adjust?

[Slu54]

Looking for suggestions on safely adjusting the pre and over travel on the AT trigger. I've turned the weight down to 3.5 lbf and I think the trigger is fine for a field gun trigger, but I was disappointed that only the break weight was user-adjustable.

It is not too huge a problem, I can group fairly well at 100 yds and can consistently hit full size IPSC at 1000 yds if wind is not changing, but I feel it would be easier to use if I could get the trigger just the way I like it.

The trigger is already quite good: break is crisp with no creep and pretravel is pretty much constant force, but it could be better. I've drawn out what my current pull (spring scale measured) is and what I'd like it to be:

[IMG2=JSON]{"data-align":"none","data-size":"full","src":"http:\/\/i.imgur.com\/YQsyKu4.png"}[/IMG2]

So two changes:

1.) Shorten pretravel displacement and make the break ("stage 2") heavier than take-up ("stage 1"): currently the incremental force to break is 1 lbf, I'd rather the takeup be lighter and shorter and the break be heavier (2 lbf) but still crisp

2.) Remove all overtravel:Overtravel is my biggest gripe, not only is it heavy (comparable to the break force) but also linear in resistance (gets slightly heaver the farther you pull back)

Any advice appreciated, thanks.

 

[Jrb572]

Others will disagree with me. When I to the AI armorers course. We were told that the trigger was only supposed to be adjusted for weight and wear and never adjust it to single stage only. But it's up to you it's your rifle just remember to check that it is safe.

 

[Supersubes]

I wont be of much help, as i think its about perfect. Just wanted to note that i think there's something to the springy overtravel that gives the gun a certain forgiveness during the firing cycle. As the rifle is violently vibrating during recoil, the trigger lever isnt hard stop against an overtravel screw, but somewhat isolated by a spring. Imaging touching a tuning fork to a hard fixed object...the fork bounces sharply. The AI Is like a two stage jewell trigger with the overtravel backed off. Both the jewel and AI rely heavily on spring pressure as opposed to sear weight. Kinda different from most others, which have a little more balance between sear weight and spring weight. Regarding overtravel, you must have some. A trigger that breaks near simltaneously with the trigger touching the overtravel stop is a recipe for disaster in a field gun IMO. The tiniest piece of grit or grime in the trigger will stop the gun.

 

[Timo Turl]

I got mine down a little lighter and remain safe. Much less and it fires when dropped hard on a concrete floor.

 

[jlficken]

You should leave it as it is. If you want the trigger you describe you will need to go to a custom rifle where you can choose the exact trigger that you want.

The AI isn't intended to function this way and I like the way it is right now. A 10" round plate wasn't an issue to hit at 950yds the other day with my 20" LW 308win barrel and 168gr Hornady HPBT load.

 

[Johnson184]

Someone please correct me if I'm wrong... but for Accuracy International triggers, you should only be adjusting two things. The trigger weight in the screw just in front of the trigger, and how far forward/rearward the trigger shoe itself is via another screw that you have to remove the skin to access.

Or do I have this incorrect?

 

[Slu54]

The overwhelming feedback is "to get used to it", and that's fine. I don't want a 1-stage, I want a 2-stage, I come from shooting ARs with 2 stage triggers (Knight's, Geissele) and have gotten used to those and shoot best with those. I will look at Sako for the next rifle, as I hear that trigger is nicer than the AI.

TJC: I don't want to go lighter than 3.5 lbf for field use, I know I can dial that screw looser.

Johnson184: For the AT trigger (I don't know how it used to be with AW and AE), the only adjustment available is break weight, via one set screw just forward of the trigger shoe. There are other adjustments that can be done, but the manual explicitly says for the user not to adjust those.

 

[davidwiz]

I had mine modded (non-permanently) to make my AT a single-stage trigger. The sear holds when dropped butt-first onto concrete from about 3'.