Home arrow Products arrow AR-15 Conversion Units arrow WSSM Conversions

If you don't need a complete AR-15 carbine and already have a mil-spec lower receiver, then an Olympic Arms WSSM conversion unit is all you need to shoot WSSM .223, .243 or .25.

No modifications to the lower receiver and no tools are needed to install the unit. Just put the upper on your complete lower and you're good to go.

These kits use custom AR-15 magazines designed to hold the Winchester Super Short Magnum cartridges.  The magazines are all metal for rugged durability.

These caliber conversion units are fully assembled, headspaced and test-fired.


Order by:

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...
$780.00 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...
$780.00 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...
$780.00 MSRP