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Wiki User
Mine is externally threaded on the barrel. The sight is a set screw to lock it in place. It is also has solder in the threads
John Loar ∙
Let a gunsmith do it
As the Lego Company has been in business since 1939 it is almost impossible to estimate how many individual customers Lego has had over the years. Currently, it is valued as the most valuable toy company in the world, however, and is worth billions of dollars.