Recently purchased a second Buck Mark to use as a dedicated silencer host. Got a good price on a Micro Bull stainless and want to have the barrel threaded. The take down screw is NOT 7/64 Hex but appears to be some kind of hex. Appears others have had a similar problem to mine. I've googled and searched for a remedy and the best I can find is to slightly modify a 3mm Hex. Anyone else experience this problem and have a good remedy?