A replacement feed lip unit for Black Dog Gen III 32 round magazines for AR-15 .22s using Colt or DPMS conversion mechanisms.
Note the raised left hand lip which acts as the ejector. Not suitable for use with regular AR-15 .22s using CMMG or Ciener format mechanisms.
Useful if you've damaged your existing one with too many drops on concrete floors.
Swaps out in minutes, remove the main spring and unscrew the two halves of the magazine to replace.