With the guns that I cleaned them, they would move freely as you rocked the action back and forth. It was always a little sluggish in moving and sometimes wouldn't move at all when you upended the action, but it always seemed to shoot OK. The staking on it was pretty heavy, and it wasnt going to break loose without a lot of reefing on it, so I let it alone. The one gun I did have that had the nut still staked, I just soaked it good with Hoppes while cleaning. Loctite or not, never had one back out enough to come off while shooting it though. Like anything else, if I can get to it to clean it, I do. They do load up with carbon like any other piston driven gun. I take the piston out and clean it on those guns that are loose each time I clean them, and put a small drop of Loctite on the nut on reassembly. Serial numbers for their stainless model started with the prefix S and SS. From 1983-1984 Universal manufactured a stainless steel carbine. Serial numbers recorded so far have been 00204 - 000430. During 1980 Universal produced a commemorative carbine. Vulcan serial numbers recorded so far have been 1014 - 2453. Loose enough you could easily spin them off with your fingers with a couple of turns. A separate set of serial numbers was used for the Vulcan model carbines produced 1963-1965. Ive owned 5 GI guns, and 4 of them had the piston nut loose when I got them, and I do mean "loose". Click to expand.It seems that the gas piston, like the later, adjustable rear sights, often had their staking broken by users, and I dont think its uncommon to find them loose.
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