Gunsmithing Where to get a length of vent rib?

Biscuit

Sergeant
Full Member
Minuteman
May 3, 2010
403
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49
Norther Cal
I am customizing an old Rem 550-1 .22, I wan't to put a vent rib on it like a Rem 600 had. Anyone know where I can get a small length of rib? Like 19". From an old shotgun barrel would be fine.

Thanks