When I built my rifle I wasn't going to use a nose cap, but I cut the stock off 5/8" back from the muzzle and I hated the way it looked. There were two possible fixes, cut the barrel or install the nose cap. Looking back cutting the barrel would've been faster and easier, but my front sight was already installed and I liked the look of it and the muzzle.
Right or wrong this is how I installed my nose cap. I measured the nose cap, added 1/8" for the muzzle exposure. Then I measured back that distance from the muzzle and made a square mark around the stock. Using a very fine stiff back saw I made a cut around the stock and started working back to the cut with chisels and rasps. Making the cut deeper as I removed stock material until the fit suited me. Was it the correct way? I don't know but in my little mind it was the simplest.
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