I'm considering the Limb Saver recoil pad. Here's the URL: http://www.simsvibrationlab.com/limbsaver/firearms/prefit.aspx
and here's what they say about their product:
The LimbSaver™ Pre-Fit Recoil Pad is a custom fit recoil reduction pad for rifles and shotguns that is easily installed after removal of the existing stock pad. The LimbSaver™ Pre-Fit Recoil Pad features our innovative recoil reduction technology that absorbs shock and vibration. This revolutionary three-step process features Sims Vibration Laboratory’s proprietary NAVCOM™ (Noise and Vibration Control Material). It is designed to displace shock on a broadband spectrum (0 to 2500 Hz) ensuring maximum shock relief from recoil and greater protection for the shooter. This superior LimbSaver™ recoil reduction system allows greater access to the firearms sport for women, youth, and the disabled. Available for many popular firearm models with wood and synthetic stocks.
They have a model specifically for the M1 Field.
Regards.
Pietro