18DAI,
Regarding the magazines. Is there any real science to the "use only in 4516-1" marked magazines? I am well aware of the of the follower and the round retention dent upgrades on the full size 4500 series magazines, but they are all cross compatible for all 645/4506 guns to my knowledge. Are not all the 4516 mags also cross compatible?
blessings to you and yours, fuzzy