Originally Posted by
Clint
To put it simply, the overall gas impulse goes toward two things.
1) accelerating the moving mass
2) overcoming friction forces during extraction
In general, adding mass reduces acceleration and peak speed of the moving mass.
HOWEVER, those extraction related friction forces decrease with time as bore pressure and temperature drop.
IF increased mass delays extraction enough to reduce that friction, the saved energy is used to accelerate the mass to normal speeds.
Clint, you nailed it.
If the extraction is delayed until case obturation has largely subsided, there is more energy left in the overall energy budget to contribute to accelerating the carrier/buffer mass to the rear.
I’ve actually experimented with a custom 9.5oz A5 stainless buffer and it functioned just as well as the A5H2 and A5H4 through your OPTIMUM 16” Intermediate Gas barrel (which is already properly gassed), THROUGH an SLR Ti AGB with about 50% restriction.... at the exact same setting.
That is nearly a doubling of buffer mass. And it STILL locked back on empty with no shoulder purchase on XM193 and my sh*tty busted aluminum mag with dented feed lips that I use for just such a test (lock back). That was 62F in the indoor range that day.
As you said, there’s plenty of energy in the system to gas the gun properly AND have more than enough margin for operation.
The fact that your barrels come with properly cut chambers and leads/throats sure does help accomplish that.
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