AR-15 9MM MAG ADAPTER COMBO 

Adapter: Magwell Adapter
Bolt Hold Open On Last Shot
One Retention Screw On Top Of Adapter, And Two Set Screws That Lock Into Wall Of Magwell Light Weight
Insert Converts Standard 5.56 Lower Receivers To Accept 9mm Stick Magazines
All Aluminum Body With Steel Inserts
Anodized Matte Finish
Accepts Colt Style Smg Mags
Installs By Inserting In Bottom Of Standard Lower

Buffer: 9mm Cal 8.2 oz 4″ Length Stainless Steel Body

Buffer Spring: Flat Flex Spring,Teflon PVC Coated

End Plat: Ambidextrous single point sling