They were a budget rifle, and there was considerable difference in the short (800) actions and the long (810) actions.
The 800 uses a Weatherby style full diameter bolt with two rows of 3 lugs, while the 810 had two rows of two lugs that were larer in diameter than the bolt body.
The three lug arrangement with it's 60 degree bolt throw lacks camming power both opening and closing which requires you to really slam the bolt handle around. Since it is tacked onto the bolt with a silver disk, electo welded. Breaking them loose is quite possible.
The firning pin is of the Arisaka piston type, and there are two different versions, the latter being better.
I believe they were first made for Western Auto under the Wester Field brand around '65, and with the Mossberg name a couple of years afterward. They seem to have been withdrawn from the market about a decade later.
They certainly look good, and are quite strong, but the safety only blocks the trigger, not the firing pin, and like the Remington 788 can never be fully trusted. Keep your chamber empty until you spot the game. :wink: