Originally Posted by
Palmetto Bug
Tuning is all about adjusting where along the pressure curve the reload happens. The adjustable gas block and/or adjustable BCG reduce only a tiny bit of gas coming through the gas tube but that is mostly to delay when the bolt gets unlocked. It's more about fine tuning the timing the bolt opening than directly reducing the volume of gas. If the unlock is delayed, more gas heads down the barrel than back through the receiver. An adjustable gas block or BCG do the same thing, it's just a matter of where you throttle the small amount of gas. Depending on your handguard, it might be easier to turn a screw on the BCG than on the front of the gas block. I need a weird, very long hex wrench to adjust one of my gas blocks. My guess would be that the adjustable BCG would be more likely to cause crud buildup in the tube than throttling the gas from ever entering the tube with an adjustable gas block. Truth is, though, once I get a gun tuned so it will cycle sub and super sonics without hitting the back of the receiver too hard, with and without the suppressor, I rarely have to adjust them again.
The buffer weight controls how quick the initial jump of the bolt is, which further times when the chamber is vented. It seems to have more effect than adjusting the tube gas. Gas tube length (pistol, carbine, intermediate, rifle) most drastically determines where in the pressure curve the reload cycle happens.
Blow back reducing charging handles simply try to seal the exit of the gas from out the back of the receiver into your face.
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