Glocks, I install night sights. Have a stippling tool but haven't changed any grips yet; future project. 1911s, installing an ambidextrous safety is a must due to being left handed. Will change GI sights to fixed combat sights. Might shape and polish the extractor. Might get nicer grips. Haven't used weaponlights, lasers or anything using batteries so far on the home defense stuff. Revolvers I don't do anything. .22 semi autos, I add a red dot sight and whittle on the grips if needed. What do you do?