4 million rounds may sound like a lot, but once you break that into bricks 4,000,000/500 = 8,000 per day. Send that out to all 50 states and you get only 160 bricks per state. Run that way for 7 days a week (round the clock prodution) is 1,120 bricks per state, though suspect it isnt a 24/7 deal so probably less than 1,000. Would not be suprised if the other manufactures put out similiar numbers. Any way you look at it is going to be spread pretty thin once you start counting the number of retail stores in any given state.