The Caldwell Shooting 310010, also known as the Mag Plus Shield, offers top-notch recoil protection identical to the original Mag Shield but boasts a significantly larger surface area. Its unique heart-shaped design broadens the area of recoil absorption, subsequently extending its coverage to include the upper arm.The dimensions and design of the Mag Plus Shield exquisitely blend functionality and comfort. With the shield featuring a 1/2\" thick, energy-absorbing pad, it delivers outstanding protection for all calibers up to and including the 300 Winchester Magnum. The shield truly redefines shooting safety and comfort.