My brother has a 1995 or 1996 HK USP 9mm (Decocker only) model that has been very reliable and durable; excellent pistol. It forced me to buy a USP Compact in 9mm when they first came out. Anyway, the little roll pin (Part 49....attached below) that connects to the guide rod is starting to wiggle out. I do not have the schematic, however, he claims it is 3.5 x 10 (metric). I went to http://www.mcmaster.com/ , however, I could not find a 3.5 x 10 roll pin. Can anybody confirm the size? Where is the best place to buy a pack of them. He also claims there is a 3 x 14 and 1.5 x 8.