There are King Arms Rail adapter for KSC/KWA USP full size, for about $20 CAD.
I have one, works fine on my KWA USP, don't know if it will fit a Mk23 (probably not) or a KJW USP.
There is also a cheaper one by Element.
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Last edited by ccyg8774; March 18th, 2015 at 15:47..
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