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I really like the barrel nut mount system, it's practically ideal. I just get wonky accuracy out of it.

The barrel inserts into the end of the suppressor, of course, but I don't think it indexes on anything. Bowers uses a multi-mount system where they sell all different kinds of mounts that thread into the end of the suppressor. I would be very surprised if there was some sort of UZI barrel...

The looser a gun is, the better it will run dirty. The tighter it is, the better the accuracy. That is the challenge with designing military firearms. People always used to say that WWII 1911s rattled "like a coffee can full of bolts." But they worked when they were literally oozing with...

I used to have a MAC10 that I would run until it was literally as hot as a soldering iron. One time I handed it to my brother and he touched the metal and it made one of those nasty whitish-yellow burn marks on his skin. Like a soldering iron would do. That amount of heat would turn Rem Oil...

what's an alignment rod?

It's not a POI thing. I shoot 5 rounds and three bullets hit the paper and make a 2 or 3 inch group and the other two bullets don't make it onto the paper at all. Almost like the can is vibrating and lightly tapping the occasional bullet. Those 158 wadcutters I loaded were part of my...

shoots great 3 inch groups at 25 yards

I have a Bowers CAC9 with the barrel nut mount, and I know a guy who has a can from a different manufacturer with a similar mount. I get mixed results with mine, the accuracy varies a lot from OK to horrible. The other guy just gets horrible accuracy. I kind of suspect that the alignment of...

I forgot all about the UZI PRO. It's kind of awkward looking.

You know that round thing inside your car? It's called a "steering wheel." If you turn it, your car changes direction of travel. No kidding, I wouldn't lie to you. Mods, fear not, we are done here.

It would be a waste of your time. We're talking about decades here. If you stuck a new extractor into your bolt, you wouldn't probably see any noteworthy reduction in function for 30 years. Mechanisms are designed to account for the 10% or 15% reduction in spring force that occurs during...

I realize that the extractor force is not going to conform to f=kx. But it is a spring in all respects, is it not?

Structural and mechanical engineers are experts (hopefully) in a field of study called "mechanics of solids." That's the main applied physics that we use to do our job. That science was pretty sophisticated a long time ago. This conversation we're having could have been had 200 years ago...

Of course we're overthinking it. That's what we do. Usually these things are more clear-cut: when you prestress a beam, the concrete beam shortens over time. That’s creep. At the same time, the force in the strands is reduced, independent of the concrete creep. That’s stress relaxation...

you can readily buy a solid steel milled feed ramp that replaces the lame mil-spec sheet metal ramp. pretty straightforward to weld it in that's all the fabrication you need what other "modification" is there?

considering that the original IMI mags are basically the best mags ever made, what's the appeal? serious question

I have the machined feed ramp and I didn't notice it helping to feed bullets all that much. What really makes a big difference is throating the chamber a little. BIG difference. On my gun anyway.

I'm not measuring phalluses, I was just making it known that the subject is not completely alien to me. Nor did I think you were attacking me. Nor am I playing the hero of engineering. Being proved wrong doesn't bother me. And I always give credit where it's due. After all, why not? Why...

I am capable of a superhuman feat: I can discuss engineering topics without getting touchy, and admit that I'm wrong when the occasion arises. I'm referred to by the Guinness Book of World Records as "The Astonishing Miracle Man, An Amazingly Impossible Being."

Looks like I posted the above to the wrong thread. Ain't I the clever one.