Superior mounting strength. Yes, they have almost as many holes as a box of donuts. And it is a good thing. No removable base system locks your scope bases down more securely than the X-Lock system. Securely mounted optics are essential to the accuracy and precision of any rifle. To ensure the new X-Bolt has the most stable mount possible, it features an X-Lock scope mounting system that uses four screws per base, replacing the traditional two-screw system. The benefits are obvious. With the scope bases being secured at all four corners rather than only held at the center of the base, allowing for more accurate placement of the bases on the receiver. This revolutionary new X-Lock system holds the base tighter to the rifle than ever before. Features: Browning scope bases are machined from solid steel Double recoil shoulder design holds rings securely, even under magnum recoil Will not accept Weaver or Picatinny type rings.