Originally Posted by
Ned Christiansen
Kino, I wonder what PSI we're looking at inside the BCG? If port pressure is well over 20KPSI, how much of that actually makes it into the carrier? By the time it gets there, after having expanded into the volume of the gas tube and carrier expansion chamber, plus, by that time-- I presume-- the bullet has departed the barrel and barrel pressure is dropping......
I tell guys, just don't hold your fingertip over those carrier exhaust holes while firing.....:bad:
BUT..... I have held carboard right on top of them while firing to get a feel for how much hell is coming out of them-- all I got was some dark smudges, no holes blown through or anything like that. My guess would be that it is hundreds, not thousands of PSI in there-- at least it is greatly reduced from whatever port pressure is in a given setup.