Countryboy77 Posted September 11, 2022 Report Share Posted September 11, 2022 You would be amazed what a hot water boil and fine steelwool or soft wire wheel could acheive. I would attempt a really good cleaning@ Link to comment Share on other sites More sharing options...
M17ap Posted September 11, 2022 Report Share Posted September 11, 2022 All Thompson barrels including Colt 21 barrel muzzle was 3/4 “. To put a unmarked 1st model comp the barrel must be removed and turn down to 5/8 “ before threading . Second an later comps barrel muzzle is 3/4 “ . I Think both sizes the TPI is 28. HTH Link to comment Share on other sites More sharing options...
Countryboy77 Posted September 12, 2022 Report Share Posted September 12, 2022 I think you have a nice Colt there.I would leave it be.She has some age but shes still beautiful. 1 Link to comment Share on other sites More sharing options...
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