These are a new polymer mag and they sort of look like the Magpul. They are really good, we have tried them in several makes of ARs and they fit and feed really well. They also hold 30 rounds with enough room in the spring left to put it in a gun with a closed bolt. We watched a demonstration where a guy ran over one with a Suburban a couple of times without a scratch. We are selling them really cheap too. They are $10 each and you can save $1/mag if you buy 10 or more. Credit cards will add 3% to your total.
Shipping is a flat $5 for the first 4 mags and $10 after that.