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Hi, This magazine will pretty much work on all AR15 in 5.56. That being said, ProMag (The maker of Rollermag) has mixed reputation for quality of their magazine. I recommend looking at other option such as magpul instead. I hope this helps.

Kevin, yes Sir it is universal. Since it is a ProMag, it may be hit or miss with reliability. The Magpul 40rd is surely a hit when it comes to reliability (out of stock at Buds currently): https://www.budsgunshop.com/product_info.php/products_id/714007715/magpul+pmag+m3+223rem+40rd+blk -------------- But can be found here : https://gun.deals/search/apachesolr_search/873750009698

Kevin, Yes this magazine fits all AR 15 platforms, but stay clear of these.