Gun Shack appears to only sell the target spring.
Accu-Trigger Target Spring - 105270 - Triggers and Trigger Parts - Replaces the spring from the standard Accu-Trigger with the spring from the Savage Target Action. It will reduce trigger pull to approximately 1.5 - 2.5 lbs. Note: This will only work in
www.gunshack.com
Do you mean the target spring is not compatible with the regular/varmint accutrigger, or do you mean that other trigger parts are not compatible between the target/varmint/regular?
I'm not sure we want a maximum of ≤ 2.5 lbs. My buddy (and myself almost) would consider a 2.5 lb trigger VERY light for a hunting rig. 2lbs would be a no go for certain.
If the target spring from Gun Shack is not capable of near enough 2.5 lbs, then it's actually too light I think.