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Commercial vendors please subscribe to Major or higher if you plan on posting items for sale. You are a commercial vendor if you sell the same item in large quantities, operate under a business name, are selling for profit, or have an FFL other than a C&R FFL. If you fall into any of these categories, a Personal Site Subscription is not appropriate, and you must purchase a Commercial Site Subscription.
The various subscription levels are detailed at http://www.sturmgewehr.com/forums/index.php?/guidelines/