ArmaLite AR-9

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The ArmaLite AR-9, a semi-automatic shotgun prototype developed by Burton Miller. The later released AR-17 was based on this original design.

The ArmaLite AR-9 was a prototype semi-automatic 12 gauge shotgun that was made by ArmaLite. It was designed by Burton Miller in 1955 and was ready to go into production, but it was never released. It was later sold as the ArmaLite AR-17.

The AR-9 was recoil operated and interestingly enough, it borrows the ArmaLite AR-10's rotating bolt. It was made largely from aluminum and fiberglass (much like the ArmaLite AR-1) making for a very lightweight firearm. Only a small number of AR-9 prototypes were ever produced.


Detailed information on the AR-9 is hard to come by, so we've collected what we can. Needs verification.

  • Weapon Type: Shotgun
  • Caliber: 12 gauge
  • Action: Short recoil
  • Weight: About 5.5 lbs (2.5 Kg)

Video / Review

Ian McCollum of Forgotten Weapons did an overview / review of the AR-17, which is based on the AR-9. That video is linked below. The AR-9 was likely very similar.