TargetTalk

Researching a question...
On a Mk II 10 inch barreled gun (all factory), what is the actual sight radius? Specifically as measured from the rear of the front sight blade to the rear (notched) sight blade.? Disregard base, screws knobs, etc. Sold mine years ago.
Thanks in advance!

316 mm, measured from my very own long tube MK II.

PS. My previous username was ojh but can't access that account anymore because I goofed with the password.