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Regular solvent traps do not have holes for a projectile or bullet to pass through. This is where monocore solvent traps differ. Monocore solvent traps are spiral-looking traps with holes in the center and throughout the cylinder. This makes them illegal, according to the ATF, since bullets can pass through the center – even though end caps are normally sealed with no hole or opening. Because of the way these solvent traps are constructed, they sometimes attract the attention of individuals who desire to use them as unregistered silencers or illegal suppressors.