They are the same gun Buds may have got a better deal on the ones that are $506 Here is how Buds sets the prices "Our website updates every 20 minutes, 24/7, with our current inventory and replacement cost. We do not price our guns manually based on our cost in each, rather we use a live download from manufacturers and distributors to set our price based on our current replacement cost. As our cost changes, the corresponding website price of each make/model will change up/down accordingly. Although our profit margin remains unchanged, our advertised prices will change frequently, sometimes several times per day"

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Hi Kevin, They're the same. Buds uses an automatic inventory price update engine that runs every 20mins. Prices are tied directly to stock levels and will change as stock numbers change. As inventory numbers go down, prices go up and vice-versa. Usually when popular items get low in stock.

The pistols themselves are identical. Buds has a disclaimer on photo and description errors. The $506 model has many more in stock than the $546 model which is the reason for the price difference.