Looks like an old Seekins 0+ baseplate. I contacted Seekins about making some and they said they had no interest in making more. Best bet is DPET Fabrication. Link belowDoes anyone know who makes these mag bottom covers?
AW/AX Mag Base Plate — DPet Fabrication
Have an AW mag and/or an AX double stack? Want a little more to grab onto when pulling it from your rifle or mag pouch? Look no further! Simply slide on this base plate and you’ll have some more surface area to hold onto during those pesky mag changes. These will NOT magically allow you to
www.dpetfabrication.com