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Okay, I've been bugged by this one for a while, mostly for two reasons... A) Smith Enterprises comes off waaaaaay to full of themselves whenever they talk about their product... and B) As I understand it they have the design under a fairly heavy patent protection and it irks me when people...

Okay, I've been plucking at the math behind Lever and Roller Delay designs and I've been getting some screwy numbers on bolt carrier mass (way too high.) I've taken a good look at this page...

This is going to sound a little off topic but bare with me and you see where I'm going with this. *We had four engineering professors (one a fluid-dynamics specialist) overseeing our work* So, just before the last semester rolled to an end me and my first year engineering team built a...

Now I assume this has something to do with the contact points between the rail and whatever you hook to it, but the way in which the dimensions are defined is just bizarre to my understanding. Can anyone explain to me why they chose such a strange way to define everything? Shouldn't they...

Recently I started looking into PTR and their rifles after I heard that they were leaving their home state in protest of new gun laws. When I got to their web page and found they were making G3/HK91 style rifles I was intrigued. Delays have always been a point of interest for me. But when I read...