Dang, I just bought 5, could have saved some $.....Prepper Gun Shop.
www.preppergunshop.com
List is $67....put them in your cart and the price of $39.99 shows up.
Ordered last Thursday...had them on Saturday.
Northlight
You are lucky. I have found that the gen 1 mags do not feed very well in my gen 2 MPX. About every 5 to 10 rounds, the bolt will get stuck trying to feed a round in sideways...Gunmagwarehouse has gen 1 mags 3 + a holder for like $60. Gen 1 mags work fine in gen 2