Tube with a bolt that goes back and forth on top

Prettier than a brand new luxury SUV. I sense the presence of an E-2 and a high interest rate.

TOOB

Why do they call it Simple Blow Back?

From what I see it takes a lot of talent to get right.

HEYOOO

edit:

H&K heehhehhehehhehehehhhehehehhehhhhheheeehhhhhehehehe