Yes there is...... I'm trying to find the bookmark, hang on. ok, well, I'm not sure about kits, but try here. http://www.tnwfirearms.com/index.shtml
God almighty, I could not even afford to feed a single shot .50 let alone a semi-auto M2. To rich for my blood. I would get one of those 30mm cannons they mount on the front of the A-10 warthawg if I were super wealthy, you know, for home defense.