I dashed off an email via their website suggesting that the chart that's in their print catalogue w/b good for the resale market. Other companies avoid the use of arbitrary fitment markings and use English words; such as the Bianchi and Safariland companies so don't need or use charts. The Bucheimer companies are the most notorious for their arbitrary numbering system for fit, which were not the same for all models.

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Red Nichols The Holstorian