I know this is none of my business, as I'm not posting in this RP thread, but there are actually some fascinating points raised by this little contretemps, so I hope my interjection will be indulged.
Firstly, and simplest, the RP rules for the Shrouds of Arda are different, are they not? This is an “open” thread, and as such anybody should be able to post as an introduction of their character. If this has become a “closed” story, then those involved in that story really should have shifted to a new thread, as I believe the intention is. It's no good complaining now because those contributors have been organisationally tardy!
Secondly, the question of guns. As PB points out, the orcs at Helm's Deep had an explosive device invented by Saruman, that was “real” not “magic”. Tolkien writes of the last years of the Third Age with sadness and regret. Sandyman's Mill, the Elves leaving Middle Earth, Saruman and his love of the mechanical: these are all lamented by Tolkien, but that does not alter the fact they are happening. The beginning of the Fourth Age does not just signify the Return of the King; it is a time of epochal change.
This RP thread is set in the Fourth Age. The desire to cast events in aspic may be strong, but change happens, and inventions are notoriously difficult to “uninvent”. The idea that the genie of gunpowder is out of the bottle fits with this concept of “progress” and its positives and negatives. Primitive firearms would, conceivably, be part of this.
Finally, I find the overuse of “magic” in fantasy discordant. Tolkien used it incredibly sparingly; I am certain he was aware of the unbalancing nature of “super-heroes”. Tolkien's magic is, generally, subtle and rarely, if ever, used as a deus ex machina,
a care not as apparent in the works of other authors. Galadriel's mirror is a fine example of the “small” scale of Tolkien magic.
And as a little addition, there is some argument that Middle-Earth is an actual, alternative history for our real world. Guns exist in our world, and have been used in some form since the 1360s. That is fifty years before the Battle of Agincourt. There's a thought!
Apologies for the intrusion. I'll butt out now.