al·most
/ˈɔlmoʊst, ɔlˈmoʊst/ Show Spelled [awl-mohst, awl-mohst] Show IPA
adverb
very nearly; all but: almost every house; almost the entire symphony; to pay almost nothing for a car; almost twice as many books.
semi-
a combining form borrowed from Latin, meaning “half,” freely prefixed to English words of any origin, now sometimes with the senses “partially,” “incompletely,” “somewhat”: semiautomatic; semidetached; semimonthly; semisophisticated.
Besides, legal AR 16's are semi-auto's. Unless of course you were being semi-serious. if so, you almost pulled it off, but count it as an epic 46th post.