The AR-15 Rifle, while eminently customizable, carries with it a few conundrums. One is the choice of operating system; do you get a model which uses gas piston technology, or the more traditional direct impingement?

Fans of the gas piston will state that impingement models are prone to jamming and often foul easily. Fans of the impingement model will call gas piston tech mechanically unsound. Who is correct, and what is the real difference between the model types here?

Basic AR Functionality – What makes an AR-15 an AR-15?

To qualify as an AR-15, a rifle must be self-loading, and be able to perform a specific set of basic functions mechanically, without user assistance. To be more specific when depressing the trigger, the rifle needs to fire a single cartridge, and t