Towards the end of WWII, in 1944, the Japanese Navy developed a copy of the American M1 Garand rifle, chambered for the 7.7mm cartridge. This followed attempts to simply rebarrel captured US guns, which did not work well because of difficulty getting the en bloc clips to function properly. The newly manufactured Japanese rifles were equipped with a 10-round magazine fed by standard 5-round stripper clips in order to sidestep this problem. The guns were manufactured at the Yokosuka Naval Arsenal, and only about 125 were completed when the war ended (although parts for 200 were made).
I had an opportunity to handle one of these, and took a selection of photos. I was not able to disassemble the gun, so I don’t have any internal pictures – but the exterior views will hopefully be useful: