Two charts have been added to compare weapons within the same category. The first is comparing prices of UZI Registered Receivers to Registered Bolts. The second is comparing prices of “regular” M60s to M60E4 (MK43 Mod 0) to M60s originally built by Saco Maremont. http://www.machinegunpriceguide.com/assets/images/db_images/db_M60-Comp1.gif