An Illinois lawmaker wants gun owners to shell out extra taxes in order to finance a new grant program for trauma centers, a move firearms advocacy groups say amounts to a "sin tax" on law-abiding hunters and target shooters.

State Rep. Kelly Cassidy, in a bill introduced earlier this month, proposed a 2 percent surtax on ammunition. The proceeds would go toward a "high-crime trauma center grant fund," which would then send the tax money to trauma centers in "high-crime areas."