I have had some done, but it's an expensive undertaking. Yes: Green or Black micarta are the only "slotted" material available from the Randall shop.
Best, Capt. Chris
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Capt.Chris Stanaback
RKCC/RKCA Founder
RKS #016
NRA Lifetime Member
CAPTSTANABACK@aol.com
WEBSITE: www.captstanaback.com