Even though my gun was drilled/tapped, I had a gunsmith drill and tap additional holes to mount a weaver base so that I had 4 screws mounting the base to the shotgun. I put a Nikon VSD on the gun and a Beartooth comb raising kit on the stock to provide correct scope to eye alignment and cheek to stock contact. Remember, with heavy turkey loads your shooting a firearm which generates recoil comparable to a .458 Winchester Mag.