I have a Green Mountain 1-28 barrel,they make one that comes with sights,ramrod ready to go,just pull the wedge out of the TC Hawkins,drop the GM barrel in,start shooting.No fitting or changes to be made.
The TC 1-48 original barrel shot 15'' to the left at 100yds.The rear sight was almost falling off the barrel to correct it.Tried different loads nothing worked.I guess I could have sent it back to TC,anyway no problems now.