I bought my son a Remington model7 Predator in 22-250 a couple years ago. Now he's 7 and shooting it we decided it was time to toss the xmark trigger in the trash and install a TriggerTech. While removing the action screws I noticed the rear tang screw is substantially smaller than normal like 1/8" in diameter. What was the purpose for this as my old model 7 had matching diameter screws.