Charlie Kirk 's alleged shooter scrawled political messages on the equipment brought to the murder scene ... expressing support for the transgender community while making antifascist remarks.

A bulletin -- posted online by conservative commentator Steven Crowder -- was sent around to agents in the Bureau of Alcohol, Tobacco, Firearms and Explosives. We've confirmed the authenticity of the bulletin with our federal law enforcement sources. Gallery Launch Gallery Getty

In the message, the ATF claims "All cartridges have engraved wording on them, expressing transgender and anti-fascist ideology." It does not get more specific as to what the messages say.

ATF also says the suspect fired just one shot from an older imported Mauser .30-06 caliber bolt-action rifle ... which they

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