M70 LA with remington .308 barrel

I went with a buddy of mine to pick up a Matthews bow he had found on CL and it was at a pawn shop here in town. They had a few rifles on the wall and one in particular caught my eye, It had what seemed to be a benchrest stock, wood, maybe walnut, not to sure. The forend at the base was was maybe 2 1/2 to 3 inches wide. Here's the kicker, it was a model 70 long action with a Remington stamped barrel chambered in .308. The barrel had a rather large diameter, definitely bigger than my 5r that has a .850 bbl. The guy at the counter told me it was an actual M24 barrel, which I'm not to sure about. I didn't see any engravings that said US M-24 or the USMC with the ordnance symbol like on the M40's. I've talked to a couple other friends that said they had heard in the Vietnam era their were some rifles made that may have been slapped together like this one. I'm curious if this maybe something worth while, or if it's some franken rifle. Any input would be greatly appreciated.

You sent me a PM on this that I dutifully totally forgot about. My apologies.
It is more than likely somebody's project rifle from CST or somebody just wanted a different build.
Early on the majority of Vietnam era rifles were off the shelf hunting rifles.
The Vietnam era M40A1 was adopted in 1966 and Remington based on the 700/40X action and was all Remington, built in the Ilion NY. 995 were built between 66-71.
They were tweaked here and there at Quantico until 76 when they were built with a heavy SS barrel by Atkinson(although they could not keep up with demand) and the receiver was clip slotted.
Hart barrels picked up the slack and are still used today, at least by the USMC. Some examples had Winchester floorplates after durability problems with the Al Remington pieces.
I don't have much info on the M24.
My dollar says Franken Beast.

Ok, I was hoping I might have found something. Hoser, islandermyk, and jamesbond007 thought the same thing.