I am planning some upgrades for my first and only (so far) 1911.Heres my list: Ext.Thumb Safety Ext. Beavertail Ext.Slide Release Ext.Mag Release Commander (skeleton) Hammer Three Hole Match Trigger Flat RMH (checkered) Carry Bevel This will be my primary HD/CCW gun.Any other suggestions ? Anything on my list not a good idea for a defensive 1911 ? Any other internal parts I should upgrade ? ETA: Are any of these parts "drop in" that I could change myself ?