Does anyone know exactly what this is? I know it's some type of variant on the M113 suspension, but am not sure of the exact model.

It is the M-114 APC. The gun barrel is another vehicle behind the 114.

It is not M114! M114 had only four road wheels on each side and was much smaller than this vehicle.

Cheers,
Pawel

That is the M59 APC. The M113 replaced that beast...

I stand corrected I went serching for the right answer and found this photos. It is indeed the M-59.

I remember growing up around those at Ft. Devens MA.

Thanks guys. That one is located at FT. AP Hill in Virginia.

The also made a 4.2" mortar carrier out of that chassis... the M84. Might have been an experimental "Zippo" as well. Had the M48/M60 low profile TC coupla with .50 cal on most. Very large APC/Target with underpowered gasoline engine... luckily, none ever saw combat but very effective during the riots of the mid to late 1960's. One in styrene would be most welcomed at least from this point of view but, would not be a big seller I'm sure. Years ago, someone scratched an M84 and wrote about it in FSM IIRC.

Two engines, IIRC.

The sucker is huge. You could drop the ramp and drive a jeep (M38/M38A1) into the beast. Hunnicut's Bradley book has a photo showing a jeep inside the APC, IIRC.

Heck animal, at first glance I thought it was the M114 as well!

Thx go to Kevin for helpin' a couple of old fogey's see more clearly!

Tread.