Jeffo1960 Posted February 24, 2022 Report Share Posted February 24, 2022 Was wondering what is the best size thread for a, .900" dia barrel for a muzzle brake, sorry if I have posted this in the wrong section, thanks in advance. Quote Link to comment Share on other sites More sharing options...
Mattnall Posted February 24, 2022 Report Share Posted February 24, 2022 What calibre of bullet are you shooting through the break? .22cal bullets are usually with a ½" thread (UNF or UNEF) .30cal is often 5/8" But then there are plenty of metric 'standards'. The OD of the barrel shouldn't really be the deciding factor for the thread. Quote Link to comment Share on other sites More sharing options...
Big Al Posted February 24, 2022 Report Share Posted February 24, 2022 3 hours ago, Jeffo1960 said: Was wondering what is the best size thread for a, .900" dia barrel for a muzzle brake, sorry if I have posted this in the wrong section, thanks in advance. The best size is always the biggest you can fit while providing an adequate shoulder to mate against. Why? because the more material you leave around the crown the longer it will take for shots to start wandering. Thats important on a barrel that has been left at 0.900" If your brake has a spigot then the shoulder is not required as the spigot will line things up and so you could go bigger. On a .900" muzzle the most common large size would be M18x1 or M18x1.5, if it was being custom made you could go M20x1 and with a spigot M22x1 The person doing the work for you should be able to advise you similar, hopefully. Quote Link to comment Share on other sites More sharing options...
Charlts Posted February 24, 2022 Report Share Posted February 24, 2022 M18 is easy to get muzzle devices for, your muzzle is similar to mine and that's been my experience. Quote Link to comment Share on other sites More sharing options...
Jeffo1960 Posted February 24, 2022 Author Report Share Posted February 24, 2022 Should have mentioned its a. 308 Quote Link to comment Share on other sites More sharing options...
Mattnall Posted February 24, 2022 Report Share Posted February 24, 2022 5 hours ago, Jeffo1960 said: Should have mentioned its a. 308 Personally I'd go with 5/8x24. M18x1 is also popular and a similar sized thread. Muzzle devices in either thread size should be easily available. Quote Link to comment Share on other sites More sharing options...
Jeffo1960 Posted February 24, 2022 Author Report Share Posted February 24, 2022 Thanks for all your input its much apricated i went with M18X1 Quote Link to comment Share on other sites More sharing options...
One on top of two Posted February 25, 2022 Report Share Posted February 25, 2022 All of my re-barrels I have done 18x1 . Quote Link to comment Share on other sites More sharing options...
Jeffo1960 Posted February 25, 2022 Author Report Share Posted February 25, 2022 Cheers Quote Link to comment Share on other sites More sharing options...
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