I've been shooting the gun for about 28 years and have always used either a uncle mikes hot shot or the original lyman nipple, It just seems like with the nipple threaded in about half way I can wobble it a little. On my Thompson guns they just feel a little tighter. Like I said it always tightens down fine and has never really been a problem it just always makes me wonder what would happen if it ever blew out while firing, probably nothing good that's for sure. Maybe just try a new nipple of a different manufacture, any recommendations? thanks guys