Muzzle thread insert

Fx Cannon end insert.

Caliber .177 or 4.5 FX 10332 - 22

Caliber .22 or 5.50 FX 10332 - 22

Caliber .25 or 6.35 FX 10332 - 25

Caliber .30 or 7.62 FX 10332 - 30