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Charles - should only take a small screwdriver (slotted tip). "Easy Peasy"

Charles, you will just need an Allen Wrench for the SIG 220R510LEGION 220 (Details here): https://www.youtube.com/watch?v=rtU3XS_I2SA

Charles, The x-ray night sights of the 220 Legion should come with a 1/16th allen wrench. Rear sight has 3 allen screws, two on back of sight. and one on side to adjust elevation. Front and rear sights are dovetailed in and you should use a sight adjustment tool not just a nylon or brass mallet and punch. Sights can be drifted in the dovetail slots securing them to adjust wind-age and use allen wrench on screw on right side of rear sight for elevation adjustment. Lot of tutorials on Y-tube.

you will just need a 1/16th allen wrench.