Everyone should tone it down just a little bit. I wouldn't want either side to get annoyed or frustrated at this submission. Or get more stressed out than they already are.
Honestly, this is the first time ever seeing this ruling, as someone who often checks other submissions, including gun submissions. I honestly don't see the issue myself with the naming either, if it is implied on the page itself what the abbreviation means.
It seems an obsolete rule, to me as well, since I know there is a lot of guns with abbreviated names out on the wiki. Maybe even more than there are full names. But yeah, that would require a request of rule changing, which, no offense, would just delay this a lot.