I don't see how it can hurt, but I also don't see why you would.
If you do leave it on all the time, remember to de-gas before you drive with it anyplace. In Pa it's a pretty umm bad idea to have a gassed up marker in your car with you. If I remember correctly its a felony in that state. Dunno about other states but I'm sure most frown upon it in some way :P
New Mag in the works.
Black ULE Body, Chrome I-Frame, Chrome Omega rail, X-valved mag.
Ice ULE Body, Black I-Frame, Black Omega rail, lvl 10 valve mag.
Red 2k3 vert feed cocker