CZ 527 SCOUT SCOPE BASE. ALL OF OUR BASES ARE PRECISION MACHINED TO THE EXACT CONTOUR OF THE RIFLE BARREL. BY ATTACHING THE BASE DIRECTLY TO THE BARREL WE BELIEVE IT GREATLY INCREASES ACCURACY AS IT ALLOWS THE SCOPE TO ALWAYS REMAIN IN ALINGMENT WITH THE BARREL AND ALLOWS EASY ACCESS TO THE EJECTION PORT AREA OF THE RIFLE.