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Front sight too loose? Is it in a dovetail? If so, you can take a punch and stiple the barrel in the dovetail which raises the surface to tighten it. If that doesn't work, carefully peen the edges of the dovetail down for a tighter fit. I don't remember if the European (metric) dovetail is smaller or larger than 3/8"; if it is larger then the problem may be that someone swapped out the original front sight. If it is smaller (someone else help out here, please!) then a sight with a 3/8" dovetail will need to be filed down to fit. Either way, it sounds like a fun project!~WH~