So here is a little known fact brought to my attention by a fellow .22 collector many years ago. So if you turn a nylon 66/77 rifle on it's left side , ejection port up, you'll notice that the ejection port is recessed fairly deep and bullet shaped in itself. You can lay a .22 lr round in that port and quickly cycle the bolt to chamber that single round. Even the shape of the inside of the receiver is shaped to guide the round into the chamber. I'm told this feature was designed purposely so that a gun could be loaded quickly for hunting/home pest control. I can tell you (from my own days dabbling in Nylon collecting) it works!

__________________
Dave