Have to disagree with a few, as there are Many differences in the design and construction of the different models. Both are fine guns but of entire different makeup. The 700 is a round reciever aka pipe reciever. The recoil lug is simply a washer. The bolt is a 3 piece affair soldered togeather. The extractor is a small piece of bent tin that is actually far more reliable than its construction would lead you to believe.The trigger is quite complicated and troublesome. The magazine box is a piece of folded tin. The 670 is a poor mans model 70. Poorly finished. The reciever is milled from a billet of steel with a flat bottom and built in recoil lug. The trigger is simple and vitually foolproof. The extractor is larger and milled into the bolt. The bolt on the 670 is a 2 piece affair IIRC. Cant recall what the magazine box is like. Not saying one is better than the other though I do have my preferences.