the plot thickens. Untitled Document. shows a remington M1917 with a notched receiver. i am now thinking (very dangerous), that the danes adapted some of their former canadadian lend/lease M1917s to fire a single shot 5.6mm (22lr) cartridge as a training rifle. i wish i could translate the language for a bit more info. it appears as though 2K of these M1917s (remington, winchester, or eddystone) had the receiver notched to secure and index an off-set single shot 22lr chamber/bore adapter. this would make the M1917 firing pin strike the 22lr rim and fire the cartridge down the bore centerline. Also, this may explain the non-standard adjustable front sight i observed. this could enable the trainee to fire in-expensive 22lr ammo while learning about sight orientation. i would be curious if the ballistics of the 22lr would make for a 50 or 100yd setting with the adjustable front sight and un-altered rear battle sight setting. now, i MUST purchase this rifle in the interest of science. just think, if i find a spent 22lr shell casing lodged in the magazine well. to be continued.....