Hello. New to this forum. I have just recently acquired a 180 series Mini 14. While removing the 20 years of closet dust off the old girl, imagine my surprise when I took the gas block apart and found no gas bushing! No big deal right, I'll just order one, I said. Got on good old Google and found a set of gas bushings, but for the 181 series and above. I know that the 180 series is a bit different in the bolt hold open and the bolt itself. My question is how is the gas bushing different, can I modify one of the bushings found around Accuracy Systems Int. And if not, is there a source for a gas bushing that will fit? Thanks to all in advance for your knowledge and input.