You're witnessin' a one man cypher-a
One hand's a gun, the other hand's a silencer
Lupe is a one man cypher-er and doesn’t rely on anyone else to be great. He single handedly encodes messages/raps that often have multiple meanings that must be deciphered by the listener.
Keeping in theme with the guns mentioned in this line, the track’s title SLR also stands for self loading rifle. In this sense, Lupe is an SLR — he can bounce back from anything and will never stop spraying raps.
On one “hand” Lupe is shooting out bullets of wisdom into the world, but on the other “hand” his message is disguised in metaphors and entendres to the extent that the verbal bullets he fires cannot be understood/heard at the time they leave his pen/mouth/gun unless you see them hit, or the effect of them hitting, and decode what has happened. People are left speechless (silenced) when he expresses his opinion.
This starts the beginning of an extended metaphor of his hand being a gun.
There is also a double entendre here with the word cypher — in hip hop, a cypher describes a group of rappers freestyling over a beat. Check a recent Lupe/Kanye/Yasiin Bey cypher here (part 1 and 2) and this old school BET Lupe/Papoose/Styles P cypher:
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