I bought them from UKMCPRO
http://ukmcpro.co.uk/index.php?optio...249&Itemid=113

10 minutes with a dremel or similar & you're good to go, there's 2 criss cross support ridges you need to reduce by 50% from the bottom inside of the grips & widen the base mag gap by 1mm to let the co2 bulb fit through.

They are wide/thick enough to be very forgiving with my amateur fitting attempts.

HTH

Morph