You need a hosting site, I'm now using Imgur

You copy the link and to post a photo you need to insert this UBB code

[img] then insert the link here, then you place at the end of the link the SAME code I listed in the brackets at the front but you have to add the / just in front of the img but still inside the brackets

Again you must add the slash / mark in front of img at the end of the link

I wouldn't hold a person's join date against them; it's the quality of their posts that matters.

PursuitSS, would it be fair for me to play that game with a poster who's not been here as long as I have been? 

Touché, point taken.

Poll (and OP) ignores what is possibly the best-ever mag for the AR: The USGI 20-rd aluminum mag with metal follower. 

If reconditioned with a new mag body coating, and a new spring, one could say that failure is not an option. 

Magazines are an item which needs occasional maintenance.  For example, the inside of the mag gets dirty, and must be cleaned lest the dirt cause unseen internal corrosion (on steel mags) or cause binding of the spring.  Another reason to clean mags internally it to compare the old spring with a new one.  Generally speaking, if the old spring is two or three coils shorter than the new spring, it's time to replace the old spring.  Yet another often-neglected regular maintenance item is that metal mag springs MUST be coated with a THIN film of oil to prevent rust.

The various colored followers are a story unto themselves.  Let's confine the discussion to the aluminum 30-rd USGI mag.  First, there was the USGI black follower, eventually replaced by the (also USGI) green follower.  The idea was to prevent the ctgs from becoming misaligned (tilted)  in the mag because of the follower allowing the ctgs to "tilt" within the mag.  Most of the later followers are called "anti-tilt" followers.  All of the new "colored" followers are an attempt to prevent this problem.  The USGI green follower seems to be a modern baseline/minimum; the black followers by all accounts should be replaced with the green followers at a minimum. 

The latest generation of MagPul followers (colors vary, and IIRC, there may be different "generations") are highly-regarded, and many users consider them to be superior to the green followers.  There are other followers, made by different mfrs, and possibly of different colors about which I am ignorant.  Some may be good, some perhaps not. 

The point is that GI magazines are considered "consumable" items by the military, and seldom repaired or maintained.  They are sold-off by the Mil for a reason.  Any and all Milsurp mags MUST be dis-assembled, inspected, parts (mostly worn springs) replaced, cleaned, and lubed.  Replacing the black follower is a must, but what you choose as a replacement is up to you.

Mag springs, if of quality construction, are not harmed by being compressed (loaded) for long periods of time.  Mag springs are worn out by many cycles of compression and extension, by being worn by rubbing against the body of the magazine, and by rusting.   Any mag spring that has the slightest rust-pitting should be relegated to range use, and the spring will need to be replaced eventually.  Any mag spring that is too short, compared to a new one should likewise be replaced.  Aside from damaged feed lips, which damage is often visible (and often correctible) worn spring are a prime source of magazine problems.  Your half-dead mag spring with a new, high-tech follower will still likely cause you problems until you fix the underlying cause.

It is an excellent idea to uniquely identify all your magazines, so that you can segregate and fix one that is giving problems.  Without such ID, they all look alike, and the troublesome mag will be indistinguishable from the good ones. 

I hope this is useful.

One MINOR correction, before the Black followers were the Colt shiny Dark Green followers. They had a Cage Code of 62667.

Just google "USGI 20 rd magazine spring" and/or "USGI 20 rd magazine".  It's also possible to cut the bottom off a 30-rd mag spring, but if your old 20-rd mag springs are worn (and thus shortened), it's guesswork at the right length.  Buy the correct 20-rd mag springs.

A few mfrs still offer 20-rd mag pouches. Tactical Tailor has some 3- and 2-mag shingles.  If you wait for a sale, they can be had for a very reasonable price.  If you are OK with dyeing, then the UCP shingles are a steal, particularly on sale.  I've dyed some green and brown, and they came out pretty well.  See my thread on dyeing in Tactical Gear forum on this site.  It's not hard to do.  

NOT to slam MagPul, but there is a reason why we are currently in Gen 3 of their AR PMags.  Presumably the first two generations showed some significant problems, and, therefore, Gen 3.

I still maintain that USGI aluminum mags with latest-Gen (another generation issue!) Magpul followers along with NEW springs are THE GTG standard.  Add a thorough internal/external cleaning, and a re-coat of PermaSlick Teflon coating, and such mags are demonstrably better than new.

Almost as good as USGI 20-rd mags with new springs.  Note that good-condition followers in such 20-rd mags are many decades old, and still working well in 20-rd mags.  I have my doubts than any plastic follower will be so durable.  Time will tell.

FWIW, I've bought a few Gen3 PMags, and they have showed no functional problems with light use, but they can be a problematic fit in some mag pouches that were NOT initially designed for PMags.  That potential issue is something to be considered by PMag users.

USGI mags wont do this:

True.

But I like my USGI

Merry Christmas to you/yours.

Or an undetectable flaw that causes them to mis-feed.