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Brockmans makes a very nice laminated stock for the Guide Gun, but pricey at $425 US. If you like doing a bit of stock fitting and finishing, Treebone Carving will also sell you a 95% inletted laminated stock.
Ramline makes a synthetic Marlin stock, but it's probably pistol grip only. A while back someone was selling a Marlin with an MPI synthetic stock, but I'd never seen one prior.
You could also try contacting Marlin to see if they have any extra Blk/Grey laminate stocks --- they've made them in the past for some of the LTD and SDT variants. The buttstock on any 336/1895 would fit your Guide Gun, but you might have to do a bit of opening of the barrel channel/mag tube channel on the forearm.