People buy 9mm ARs to save money (quite often) and then buy expensive mags. Odd.
I never responded directly to this excellent point.
It costs $1.50 per round for frangible .223 ammo at my club/indoor range, and they sometimes run out of stock, and you're not allowed to take any unspent rounds home.
So to blast off even just 10 rounds in your .223/.556 AR is costing $15, 50 shots $75, you can do the maths.
9mm costs .25 cents a shot on average, so 50 shots for $12.50
You figure even shooting just 100 rounds a month will save you $120 - 9mm versus .223 frangible, so in a year you're talking $1440 in savings!!! I paid about half that for the gun!!!
The great thing about a 9mm AR is that it is almost exactly the same as a .223/556 model (blow-back, sans gas tube), so you're learning to use an AR system, as opposed to any other 9mm carbine - such as JR Carbines, which are great but very different in terms of handling.
So it doesn't surprise me that some people shell out $300 for a Colt mag.
If you belong to an indoor range (mine is 15 min. away, unlike a 1 hour drive to an outdoor range), limited to pistol ammo, and you really enjoy the real AR platform, the 9mm AR is king.
So this should be a very well catered to market.
Patrick Sweeney, the gun mag/book writer, pointed out that the 9mm AR is ideal for LEO that use it for qualification shoots, since it is ideal at indoor ranges, a real advantage in the winter, that provides a similar .223/556 "kick" that a dedicated .22lr upper can't.
That's what got me interested in the 9mm AR in the first place, it's a fantastic trainer. Even against regular .223/556 ammo, that has an average cost of .40 cents, still .15 cents more than, and you're not restricted by pistol range limitations - though they may still gripe about you pulling out an "evil assault rifle thingy" at some pistol clubs.
So I'm determined to resolve this mag issue, it'll get sorted out eventually, just got to keep at it, all the best.
I noticed that in the latest inventory offering of IRUNGUNS.US they are showing a Colt 9mm AR as coming soon.