Mossberg FLEX Standard Stock 13.5" Length of Pull for Mossberg 500/590/590A1 12 gauge shotguns. Excellent condition. Comes in original packaging.  This item cannot be found anywhere in stock in Canada. This is ONLY compatible with the FLEX system. Must have the FLEX adaptor installed on your Mossberg 500/590/590A1 12 gauge shotgun. *** Shipping at buyer's expense ***