Does anyone know if all aftermarket AR15 magazines are compatible with all brands and models of the AR15. I sent an e-mail to a couple of companies that sell all types of AR15 stuff with that question and they haven't gotten back to me. I want to buy some additional magazines for the Colt that I just bought.

You might want to wait a bit if you're not in a big hurry. I was talking to a dealer yeaterday who told me that a company is making brand new 15 round mags for the AR. He didn't know how soon they'd be out though.

Yes, in general AR-15 style magazines fit all AR-15 style rifles. There are a few brands of rifles which are supposedly picky (early S&W MP-15, for example, although my recent one takes any AR-15 magazine), but in general they all fit each other.

tips hardware sells modified magpul pmags to fit 15 rounds. they are $40 each plus $10 shipping, no matter if you order 1 or 10. I ordered 3 and they're excellent. the modification is clean and unnoticeable. shipping was very fast. These mags are compatible with all .223/5.56 AR15/M4 rifles.

 

http://www.tipshardware.com

Make sure your mag. from Tips will only hold 15 rounds. Some of them he's sold hold 16.

 

Here is a really nice 15 round mag.

 

www.pri-mounts.com

www.riflegear.com/c-47-556mm-magazines.aspx

 

These are nice too. I have a couple.

Just got back from Cabelas. They had a barrel full of Bushmaster AR magazines. Bushmaster isn't that far away so they push them.