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ATR-100 scope size?


Copper BB
After purchasing a .243 in a camo stock, I purchased a Riton primal scope,3-9x 40 and mid rise rings. Upon mounting ie on a EGW rail, I found it was so high that I could not bore sight. When I went to low rings the scope adjuster ring hit the rail. After mounting a standard 3-9x32 I still find I cannot align the bore to the scope ,it’s making me crazy. Could the fluted barrel be the problem? Any advice?
I've not used the setup you're asking about, but can the extension thing on the magnification adjuster be removed or unscrewed?

Seems that's more the issue than anything else because the scope could be mounted otherwise.