22lr : Tikka T1x
223 : Tikka T3x Stainless SuperVarmint or SuperLite - depends on if he walks or stationary shooting.
308 : Tikka T3x Stainless SuperLite
Tikka Ringmounts or Sportsmatch rings
I prefer Kahles or S&B scopes.. but they can be a bit expensive.
Upgrade to McMillan stocks later if you want them to be a "for-life" rifles.
Can this selection of rifles, scopes, and mounts be purchased for $1,800?