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Olympic Arms' conversion units will let you use your complete mil-spec lower receiver with one of our top end assemblies to use one of a number of popular caliber cartridges.  We have kits for:

  • Pistol Cal (9mm, 10mm, 40 S&W, 45 ACP)
  • Winchester Super Short Magnum (WSSM .223, WSSM .243, WSSM .25)
  • 7.62 x 39mm
  • 6.8 Remington / SPC
  • .22LR Conversion

Our conversion kits and systems require no tools and take just mintues to install.  In most cases you just put the top end assembly on your lower and load up the magazine.  Our kits do not use mag well inserts and do not require any permanent or damaging modifications to your complete mil-spec lower receiver.



Order by:
Complete upper receiver assembly manufactured for 7.62 x 39mm and includes one magazine.  Product Details...
$588.90 MSRP

16" 6.8 SPC Upper Receiver

[ SKU: K68-UR ]
Complete upper receiver assembly manufactured for 6.8 Remington/SPC and includes one magazine.  Product Details...
$637.00 MSRP

16" K74 Upper Receiver

[ SKU: K74UR ]
16" carbine in 5.45x39mm  Product Details...
$608.40 MSRP

24" WSSM/OSSM Upper Receiver

[ SKU: K8-MAG-UR ]
Upper conversion unit for your complete AR-15 lower receiver designed for the Winchester Super Short Magnum and Olympic Super Short Magnum  Product Details...
$895.70 MSRP