Hey Guys,
I am not new to firearms, nor shooting, but I am VERY new to the mechanics of firearms, cartridges, and ballistics.
I have been doing research for weeks and I have to admit I still do not completely understand what Head Space is, how to measure it, if I can fix a problem gun with "improper head space", etc...
Can someone, in plane English explain what head space is? I know I sound really REALLY stupid, and I accept that, but with my screaming baby, and my 1 hour of daylight free time a day, coming up with catchy searches for the M4 search function, and googling, and going to library, and what not isn't really working for me. I'm new to firearms so all the subject specific cross references in the definitions of Head Space I find just leave me confused.
If you could sum up Head Space in one sentence what would it be?

