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Jamie - the Banshee is shipping with the ProMag 5.7 20 round mags, so I'm sure this one will fit as well. Should be good to go!
Jamie, This ProMag extended magazine is about your best option at BUDs They also have 20 rounders. FNH has 20 and 10 round polymer magazines for about $35.00 at many retailers and online sites.
Jamie - As a side note I did find somethi9ng interesting on the CMMG web site - they stated the Banshees ship with 20 round mags because they found, through exhaustive testing, the 20 round mags were much more reliable. SO .. it should fit and work .. but it might not be 100% reliable. I imagine this is due to the shape and size of the 5.7 cartridge.
Jamie, Promag in 5.7 get on average 2.5 to 3 ratings on reliability (Just look up the UPC code at various vendors and check purchaser reviews). A better option is to modify Factory Magazines with extender kits : https://www.budsgunshop.com/catalog/search.php?q=852005002028&type=
Jamie - the Mag Extension kits James recommends are getting 2 - 3 star reviews everywhere as well, so I don;t know how that is a 'better option'. I'd take my chances with a factory 30 round mag before I would an add on extension. And as I said, CMMG ships ProMag magazines with their Banshees .. so CMMG must think the 20 round magazines are OK.
