it seems thew redhawk gun and nails shopbot carried are history. senco came out with a gun and they bought out redhawk but they are discontinuing their gun as the nails are no longer available. you can still get all sizes but 1.25 the most common size. the senco gun is so much nicer then the redhawk it does not leave so much nail sticking up so you don't have to use extra long nails that cause more shattered nails.
I just got nails from raptor and they work fine in the senco gun and I am sure in the redhawk gun too. they cost a bit less and shipping costs less for the most part.
so from Now on raptor is the only choice in town. you can get the seno gun for about the same price but I doubt you will be able to buy replacement parts for it so it is a dead end product.