Very rarely. They started using them about June-40 until Feb-43(gas trap era)


Quote Originally Posted by gcr-g View Post
I have a M1icon that I have owned for years that has a metal cover pressed over the front sight retaining screw. The cover was punctured sometime in the past (not by me,) with an Allen wrench but is plainly visible. I have never seen another M1 with such a cover. I know M1’s left Springfield Armory with such “tamper proof” covers in place over the front sight screw but I have never seen another one. Every part in this rifle is listed in S. Duff’s Data Sheet book for production during July-August 1942. My question is how often are M1’s encountered with the seal still in place?