No effect on point of aim, It still does 2.5 inch at 100m. Irons before I set them. I used an aim mark inside a 50m long shop, I put laser sighter in the muzzle put gun in a gun vise checked the point of aim before working on it and put them back with aiming in the same spot.
You have to cut pin groves on the barrel in exactly the same angle/level
You have to cut pin groves on the barrel in exactly the same angle/level


















































