Quote Originally Posted by davey_c View Post
Hi

Can anyone tell me if there are any differences between Parker Hale sights that are marked PH5c and 4651A?

I have 2 sets of sights marked 4651A, one on my Envoy and the others are spare and was wondering if they are the same as the PH5c sights.

Many Thanks

Dave
As far as I know they are the same.
I have read that the 4651A sights are calibrated for 7.62 ammunition (but also read there is virtually no difference in trajectory out to about 300yds)

http://www.chuckhawks.com/rifle_trajectory_table.htm
(Look at 308 and 303 = 0.2" difference at 200yds)