ATI 9mm Adapter For 5.56/223 Lower
You can now convert your standard AR-15 5.56/223 rifle lower to take 9mm magazines with no required modifications to your lower but YOU MUST change out your upper and buffer to correspond with the ammunition.
This 9mm adapter accepts Glock Style double stacked 9mm and .40 caliber magazines.
WARNING:
In order to shoot 9mm ammunition out of your 5.56/223 lower, you MUST change out your upper receiver and buffer tube.
https://www.americantactical.us/5864/...
"Undaunted" Kevin MacLeod (incompetech.com)
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