NimbleJack3 said:
- I am aware that the M4 family, the G36 and the AK-74 all use the same ammunition. Are the magazines interchangeable?
Not sure where you heard that; the AK74 family round is 5.45x39mm, NATO round is 5.56x45mm. As for the M4 and G36, no: the G36 polymer mags are proprietary and not STANAG compliant; without an adaptor you won't get a STANAG magazine in a G36 or vice versa.
NimbleJack3 said:
- Why don't the shapes of iron sights like the ones for the TAR-21 and the M16 match up? Why don't they, for instance, use sights similar to the ones found on most semi-automatic handguns?
Don't really understand what you mean, but this [http://en.wikipedia.org/wiki/Iron_sights] is a good enough primer on sights. Read that first. Broadly, handgun sights are only designed for accurate fire at dozens of yards, you need a more precise sight for a rifle that's supposed to be good for hundreds.
NimbleJack3 said:
- What's the double-trigger system on the M203 used for?
The thing that looks like a second trigger is the safety lever; PMG shows it on, you swing it forward to rest against the front of the trigger guard to take it off.