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From the end (where front sight is located) back to where bullet enters barrel.
AIM B Style Red Dot Gun Sight-wrong your barrel
You will find it on the barrel directly in front of the sight.
You will need the help of a gunsmith.
Yes, but they are very rare. Octagon barrel Special order. Can have optional features such as tang sight and front sight fold down beech front. Extremely rare!
Look at gunparts.com or Numrich arms
The same as you would any other rifle.
Barrel, Trigger, Trigger guard, hammer/striker, front sight, rear sight, chamber/cylinder, frame, grip.
Sometimes it on the top of the barrel near the rear sight. Sometimes it's on the side of the barrel.
The rear sight must move in the direction you want the point of impact to move. The front sight can be moved in the opposite direction.
So you can aim down the barrel to sight, whatever you shooting at...