This is what I have found on my XDm45 5.25
Stock 6lbs 14oz.
PRP UMT kit 4lbs 4oz. after a little better fitting and some pollishing it dropped to 4#
PRP UMT kit + Titanium Striker Safety Kit + Titanium Striker Status Indicator Kit 3# 1.3oz.
I'm your huckleberry
Ruger MKII competition slab side
SKS SGgunworks bullpup
Many old military rifles and current hunting rifles
Remington 870P MAX
Many old shotguns. single shot, over under, bolt action, pump. All 45 years old and older.