I'm a big fan of the 70. Its far less bulky and seems ton be a tighter made sight than the 80. However, I think the 70 was made to compete against the Lyman 48 (which I won't argue is the better of the two) and the 80 was made to compete against the Lyman 57/66. I'll let you draw your own conclusions from that however the 80 is certainly up to its intended task as a hunting sight and beats the pants off the open sight on the barrel.
