If you use modified AR15 mags,you will also have to cut a step into the rear of the follower so that your bolt hold open will work.No big deal,takes two minutes with a Dremel.And you may want to grind off the bulge on the left side of the mag.Don't need it on the AR180 and it makes the mags fit a little too tight.I have one original AR18 mag,I made the rest,and it was easy.There is a company selling original mags for $40.00 a pop,ask over on AR15.com,because I can't remember who.
Edited to add: Try www.DKMAGS.com ,they have originals.
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