Which begs for the following question.
If one can mount a Spikes 37MM flare launcher under the barrel, and then a Gecko 26.5MM flare launcher to the Spikes; would that be an assault weapon under SB281?
If you welded two flash hiders together and screwed it on your barrel, would that make it a banned weapon?
I shouldn't think so. It's a "feature," it never specifies how many barrels or firing mechanisms said feature can have.