WTS – Olympic Arms CAR-9mm Pistol Upper Conversion Unit, 10.5” 9mm Barrel, 32-rd Sten Magazines $330

Location: Los Angeles

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Want To Sell - (1990s) Olympic Arms CAR-9 conversion unit built on A1 Carbine Upper receiver. AR-15 chambered in 9mm. Blowback system. Includes complete upper receiver conversion unit consisting of 10.5” 9mm barrel, 9mm birdcage flash hider, carry handle type upper receiver with 9mm bolt and carrier, charging handle, sweep eject spring built into the upper receiver, lower receiver mag block with thumb latch mag release, six 32-round modified Sten 9mm magazines and two Sten magazine loading tools. Fits mil-spec AR-15 lower receivers with mil-spec fire control group components. This is the original Olympic Arms CAR-9 conversion unit. It is been carefully used and enjoyed since I purchased it and has considerable life left in it. Sold in good working order, as is. No warranty is implied.

The buyer is responsible to research and understand this device and its safe usage, applications and functions as given in the instructions in the original user manual. Buyer is responsible to receive, possess and install this device according to the current laws of their agencies having jurisdiction.

This is the ORIGINAL 9mm AR15 conversion assembly. This used CAR-9 conversion unit is a complete upper AR15 style receiver assembly chambered in the wildly popular and affordable 9mm pistol cartridge. This 9mm upper is 100% complete and ready for installation on any standard mil-spec AR15 lower. Installation is as easy as swapping out the upper receiver unit, and placing the magazine well block/mag release adapter and switching to the modified 9mm Sten magazine. No need to change the hammer, trigger, or recoil assembly. All the necessary modifications to convert to 9mm are contained in the upper receiver and the magazine adapter. Simply drop this upper on your lower, add the magazine adapter and swap to the modified Sten 9mm magazine, and you are ready to shoot. Reverse back to your original configuration whenever you wish. Safe to use +P and +P+ ammunition.

This assembly is complete as it was introduced in the 1990’s as Olympic Arms’ first generation conversion unit. Since its inception, other versions, using different conversion parts and functions have been introduced and marketed. This assembly is no longer available through Olympic Arms and is not supported with spare parts any longer.  

This unit is used but still has plenty of life left in it. Having said that … I always had the expectation that adding this unit to my range shooting program was for fun and enjoyment and gave me a cheaper alternative bullet to shoot. I never intended to use it in battle. In that role, it performed up to my expectations. It was always an attention getter at the range.

Cost $330 plus USPS Priority Mail shipping charges. Payment required within 10 calendar days. USPS money orders or PayPal "Send Money To Friends And Family" options only. No exceptions. Will not separate, no trades, and will not ship outside of the U.S. 


Because this kit includes high capacity magazines, this product is also restricted in the States of California, Colorado, Connecticut, Hawaii, Maryland, Massachusetts, New Jersey, and New York, as well as Washington D.C., and may be restricted in other local jurisdictions. It is the customer's responsibility to be aware of and abide by all applicable local laws. Please refer to the following link for further information:


Email me at wenNOdent@aolSPAM.com 

Remove the words NO and SPAM from the email address. 

Thank you for looking,



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