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Why are the rear top rivets rounded

2421 Views 12 Replies 10 Participants Last post by  Lucky#13
As I do my build I was wondering why the rear INSIDE top cover rivets are rounded and not flat? Would it be easier to hold them in place for riveting if they are flat? I know you grind one side to fit closer to the top of the top cover, but the end is rounded.

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I come up with two things:

1) I don’t think it’s about rivet strength, but rather the Top plate. The rivet hole is very close to two edges of the material, and cutting a chamfer means even less material to take the load.

2) As someone mentioned earlier, most rivets on earlier weapons have round heads. It was probably common practice to use round head rivets whenever possible; no need for cutting the countersink or grinding the head after peening. Cutting a chamfer in the inside of the Top plate will require a milling operation and a custom cutter. Is it really worth all that trouble when a pan head will work. The profit motive tends to eliminate unnecessary machining operations.

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