There are a couple of things I think might be relevant:
Motti: Finnish tactic in the Winter War of cutting Soviet units into bite size chunks and then massacring them.
More likely as it's in a thread title "Rifles" could be references to John (I think) Motton, founder of an Australian gunsmithing dynasty. Motty's were rifles that had been accurised by him, or sights added by him. He stamped his work and many rifles accurised by him are referred to as Motty's.
Further off the mark there's also an obscure slang word: Motty which means c*nt, but I can't see how that's at all relevant to the thread.
Unless of course you're referring to that legendary protector of Western Civilization: the great John Mottson.
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