Appreciate any info re: mod 41 .22 LR. This is apparently a 1961 model,NIB,unfired with a factory installed muzzle-brake,#111190. Advised by a match shooter that he had competed with an exact type in matches and learned that about 100-pieces or so were made for the CIA and had about 1/4"-3/8" barrel longer than the slide to attach a devise. Request any pertinent info to verify this. Emails appreciated..or call,...574 233-4867(Business-EST)