Battler, sorry I don't know whether the accessory for the 1200 will fit the 1300.
You can order 870 magazine extensions from Scattergun Technologies (http://www.scattergun.com) or Dillon Precision, which sells Scattergun accesories (http://www.dillonprecision.com). I'm sure there are other places which sell magazine extensions for the 870, including CTD (http://www.cheaperthandirt.com) and maybe Tapco.
HTH,
Justin
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Justin T. Huang, Esq.
late of Kennett Square, Pennsylvania
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