Originally Posted by
MistWolf
"See, Capt'n, that's why, although you fly it, it's my airplane. You ride her hard, use her, abuse her and at the end of the day, it's this lowly airman that sweats and bleeds over her until she's put back to rights. I understand her. And trying to translate what you told me is wrong into what's really wrong adds time to the troubleshooting. You'll tell me the hydraulics don't lock the landing gear (when I know the hydraulics weren't designed to lock the landing gear that they lock mechanically) when the real trouble is the the landing gear light didn't go out because the position switch is bad"
They are locking lugs not tabs. Not everyone knows that all the cam does is rotate the bolt or somebody wouldn't have made the claim that the cam along with the locking lugs locks the bolt.
The dwell time is measured from the time the bullet clears the gas port until it exits the muzzle. Once the bullet clears the muzzle the gas pressure drops. Self loading small arms are designed that the bolt does not extract the spent casing until the pressures in the barrel have dropped to safe levels.
Carbine length gas systems have their ports closer to the chamber where pressures are much higher than they are further down the bore. In a 14.5" barrel, the distance from port to muzzle is shorter than it is with a 16" barrel. The BCG is exposed to these raised pressures for a longer time. Again, that's because the bolt must stay locked until pressures in the barrel drop to safe levels. If you used a carbine length gas system with an 18" or 20", dwell times are even longer.
Sure, Go Middy, YAY! But all you have to know capt'n is how much more violent the middy is compared to the rifle length system because you can see it doesn't really matter. Except to those who have made an effort to understand how it all works so they can be kept running