If you have mags that actually say Colt; I'd clean them, try to find some cosmoline, and lube them for hard storage. Imho. Colt fans and original Colts go for higher prices. Ok, I said that wrong but you get the Idea.
On new firearms, I tend to box the original mags, after testing & cleaning, and use quality 'aftermarket' purchases. (Sometimes, some firearms only have the factory shipped type mags as only ones that are available, there is does not matter.) This may help the price negotiations, sometimes, if you have the original 'shipped with' mag(s). {Although I, ironically, never plan to sell any of my firearms.} You also have a few backups if you run into an issue, like a boating accident.
Find one, type/model, that works for you and your platforms. Invest in them. Increase their number when you can. Carry & range, (using), loaded sitting, (staged in safe/quick access home defense box), ready for loading, ('extra' stand-buy supply), and stored for future, (long storage/end of world thing). Worst case, you have supplies during shortages'.
Carry, 1 in gun w/min 2 reloads. 3 at home loaded, 3 in bag waiting. This is the minimum to have if you exceptional at avoiding trouble. A number of people also have a set of 'range' mags. Older/worn units or ones that are not 100%; use at range and have to practice malfunction clearing drills as well. (Or, dinged up in training, working fine but replaced.) Any < 100% is suspect. {{ProMag, 15 Rd in 45, range only use.}}
Amazing what a new spring can do to a high mileage magazine.
Get the basics (needs) covered, then add to backup supply.
I go for the 'extra' round, (8 rd), flush fit, pushing 230s in regular or +P. Some go for the 10 rd, just for reloading, some all the time. All mine are the same so it cuts down on variables. Same gun, same place, every day. Remember to test out any defensive ammo before you carry it or have to use it defensively. Cleaning.
Also, there are many I have not tried. Does not mean they're insufficient; just, I haven't used them and have no data.
