I got these mags at an auction today . The round one came in a box of what they called gun parts, had four 5rd garand clips, a ww2 garand sling, scope covers..... there are seven of the long mags . I have no idea what they are for . Perhaps you can help me? If you need them let me know. I have since learned that this is a rotary mag for a Johnson rifle and Mags for a Johnson Light Machingun. I have a question on the rotary mag is this ring a part of the mag? If not do you recognize it as being a part for a Johnson Rifle? It was wit the rotary mag in the box of gun parts and I can not find a breakdown of the mag or rifle that might help me to identify it. I have also put up a few pics of the LMG mags I have 5 of these LMG mags for sale for $250 + postage and paypal fees . or $55 each they are all marked diff. 4-NE-42 1-CA-42 9-NE-45 8-NE-43 6-NE-43 Thank You Frank V. reduced to $45 ea $200 for all five