Previously the minimum amount of characters index was three to keep from indexing largely useless words. However, in deciding whether to whitelist 2 character terms manually (such as AR, AK, HK, etc.), I figured it'd be easier just to open it up to all words greater than one character long. After a bit of testing, it was determined that while it did double the size of the search index, the performance cost of those searches was marginal at best.
So that means searches for guns that have two-letter abbreviations will work.
So that means searches for guns that have two-letter abbreviations will work.