Order Online Name (required) Email Address (required) Contact Number (required) Caliber of your rifle (required) Payment Option (required) —Please choose an option—EFT Collection Option (required) —Please choose an option—Collect at ERC EngineeringI will arrange my own courier Quantity (required) —Please choose an option—1234567891011121314151617181920 Screw Thread on your rifle barrel (required) —Please choose an option—M12 x 1M13 x 1M14 x 1M15 x 1M16 x 1M17 x 1M18 x 11/2" x 20 UNF1/2" x 28 UNEF5/8" x 24 UNEF9/16" x 24 UNEF9/16" x 28 SPECIALI don't have any thread yet If you have checked the option above stating "I do not have any thread yet", and would like us to determine the thread for you, what is the OUTSIDE diameter in millimeters of your barrel at the crown where the projectile leaves the barrel? Please measure it with a vernier caliper, not a ruler. Remarks