Mark has recently sent me an update to the ItemRight-HeavyWeapons set. The numbering of the items has changed, so if you have a saved character using something from this set the odds are that when you load it, he or she won't be holding what they used to be holding. Such is life with an alpha product, I'm afraid, though I do apologize for the inconvenience. The items are all still there, they just have different "names" now.
Thanks for putting all this together, Mark, your hard work is much appreciated!