Stern def.Magazine adapter ad9 ar-15 to glock 9/40 mags

FEATURES:
Made in the U.S.A.
Constructed from 6061 T6 aircraft grade aluminum
4140 NiB coated feed ramp
Hard coat anodized type 3
Sturdy Construction
Ergonomic mag release
Works with all generations of Glock magazines
Works with any mil spec ar15 lower receiver
All gun components besides the Bolt and Barrel remain stock

Other Features: Must be used with a 5.4 ounce buffer or heavier when using a carbine spring.Buffer not included.Allows standard mil-spec ar-15 lowers to accept 9mm and 40s&w glock magazines, requires a glock cut bolt