Dillon Precision 20213 RL 550 Conversion Kit 7.62×39 Ru 7.62 x 39 Russian Rus Review June 15, 2018October 26, 2018 - Corsairier Contains: Shellplate, powder funnel, and locator buttons. A conversion kit is needed for each caliber on the 550B. Conversion Kits can easily be installed in just a few minutes and change easily for fast caliber switches.