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Cylinder choke has no constriction (.000) and is the same internal diameter as the barrel.
A full choke has a .035 constriction relative to the barrel internal diameter.
IC with a construction of .010 is considered an open choke.

https://www.briley.com/c-456-understanding-chokes.aspx
A full choke has a .035 constriction relative to the barrel internal diameter.
IC with a construction of .010 is considered an open choke.

https://www.briley.com/c-456-understanding-chokes.aspx
