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Muzzle break thread sizes
FWAddit
Member Posts: 918 ✭✭✭✭
I recently acquired a P17 Enfield with a .270 barrel fitted with a muzzle brake labeled Johnson-Gartman. I assume the whole rifle was put together by Johnson-Gartman Custom Guns some years ago.
I hate the muzzle blast and don't mind .270-level recoil, but with the single load I have tested, the rifle shoots better with the brake in place than without it. It occurred to me that the Browning/Winchester BOSS CR (conventional recoil) accessory might fit onto the threaded shank for the Johnson-Gartman and increase my options for matching barrel harmonics to selected loads. The shank measures .605 in diameter; I don't have a thread gauge to determine TPI.
Anyone know if it will fit?
If not, where can I find a thread protector?
I hate the muzzle blast and don't mind .270-level recoil, but with the single load I have tested, the rifle shoots better with the brake in place than without it. It occurred to me that the Browning/Winchester BOSS CR (conventional recoil) accessory might fit onto the threaded shank for the Johnson-Gartman and increase my options for matching barrel harmonics to selected loads. The shank measures .605 in diameter; I don't have a thread gauge to determine TPI.
Anyone know if it will fit?
If not, where can I find a thread protector?
Comments
You should strive for the tightest fit that can be assembled by hand.
Any machinist has a a set of thread pitch gages.