I just purchased a Winchester 1300 Defender and would like to add the Surefire forend weaponlight to it. I looked on the Surefire website and in their print catalog(last year's) and it listed a model number 6/936 for "Winchester 1300 Defender with Long Forend". Is this the correct model to get or is there another one not listed? Better yet, do I have a long or short forend and how do I tell? Also, is there anywhere online you guys would recommend to get one if there is a model for the shotgun I have?