Rob,
4" or 5" are doable (3/16" stock). Anything longer? Not-so-much (1/4" stock).
Capt. Chris
_________________________
Capt.Chris Stanaback
RKCC/RKCA Founder
RKS #016
NRA Lifetime Member
CAPTSTANABACK@aol.com
WEBSITE: www.captstanaback.com