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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
  • Conversion Systems (.22 LR & .17 MK2)

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.



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Complete upper receiver assembly manufactured for 6.8 Remington/SPC and includes one magazine.  Product Details...
$637.00 MSRP

Complete upper receiver assembly manufactured for 7.62 x 39mm and includes one magazine.  Product Details...
$588.90 MSRP
  • This product cannot be ordered online.

Complete upper receiver assembly manufactured for 9mm and includes one modified 32 round Sten magazine.  Product Details...
$721.50 MSRP

24" WSSM .223 Upper Conversion Unit

[ SKU: K8-MAG-UR-223 ]
Upper conversion unit for your complete AR-15 lower receiver designed for .223 Winchester Super Short Magnum.  Product Details...
$895.70 MSRP

24" WSSM .243 Upper Conversion Unit

[ SKU: K8-MAG-UR-243 ]
Upper conversion unit for your complete AR-15 lower receiver designed for .243 Winchester Super Short Magnum.  Product Details...
$895.70 MSRP

24" WSSM .25 Upper Conversion Unit

[ SKU: K8-MAG-UR-25 ]
Upper conversion unit for your complete AR-15 lower receiver designed for .25 Winchester Super Short Magnum.  Product Details...
$895.70 MSRP




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