I have a pre 64 M-100 that was my fathers. Nice rifles, work okay if kept clean. The mags are selling for a $100 ++ a piece. They were a better made gun than the Remington 742. Semi's were popular back east in the hunt camps. We had five fellas using M-100's in my old hunt camp. They were never a popular gun over all, like most semi's fellas never cleaned them and they would jam. The M-100 and the M-88 were popular here in Canada, they never sold well in the US. The M-100 had a recall out over it's firing pin. The pin was known to break and protrude through the bolt face firing the next up coming round before the bolt was closed. It was a rare happening, but it could really spoil your day if it did. The recall is still in effect the last time I looked it up, in other wards the parts are free if you can get them up from the US. The firing pin parts were available to purchase here in Canada. About a $150. retrofit last time I checked and best done by a gun smith or some who is very familiar with taking a M-100 completely apart. They can be a tricky disassembly and reassembly to the uninitiated. Also some of manufacturing years used plain steel gas parts which were prone to rusting from condensation during firing, the good gas internals were stainless steel. Regardless if the gun, mags and ammunition was kept meticulously clean they worked well. If your gun is in good shape and has had the recall done it should fetch $650.... $700 if it has two mags. With no recall done and one mag $450 to $500. It is a limited market for these types of guns as most if not all younger folks want black synthetic stocks, on an AR platform or since the Liberal ban in bolt action, and of course chambered in one the now trendy caliber's like 6.5 Creedmore. Most fellas these days find a .308 just to mundane and boring.