I have a brand new Angel Custom M4/M16 to MP5 mag adapter with Angel Custom Hi-Cap magazine for sale,still in box/bag. Only test fitted in my A&K stubby M4,never fielded with. Reason for sale is i didn't like the look and decided to stick with M4 magazines. Evike.com sells this product New for $33.00(with the mag) Price is SHIPPED for U.S. only, payment via PayPal.