All Renegade barrels are 1" across the flats. TC Hawkens measure 15/16" for .45 and .50, and 1" for .54 factory barrels.

In theory, GM barrels that measure the same will drop in. In practice, they may require a bit of work on the barrel tenon, the rib, the barrel channel, or the hammer. My 15/16" dropped right in. My 1" GM barrel wouldn't fit one stock, but dropped in another without any problem.