If the nozzle retracts that means the pressure inside the bolt carrier is gone, aka the gas input is already shut off, therefor grabbing the nozzle or not does not impact the recoil in a positive way
I don't understand why you take this in such a personal level. Maybe some of my words came out stronger than I intended, if that's the case I apologize, please keep in mind that this is not my native language. I thought we were having a technical discussion, nothing more.
For hi-speed cameras, there's always gas venting, as all the gas that moved the bolt carrier has to go somewhere
, that's the standard functioning of any modern GBBR. I'm not referring to that. I meant simply looking at the nozzle position as the bolt travels back,
and it will be super clear if the disconnection is occurring at the right moment or not.
If the bolt has a mechanical force causing premature disconnection, such as the upward tilt in the nozzle caused by the magazine itself, the nozzle will go back with the bolt before the point that's supposed to, i.e. when the bolt has travelled the full length of the nozzle. That causes the gas flow to stay open (as the bolt has not reached the point where it disengages the valve locker) even though there's no connection anymore between the magazine's gas route and the nozzle input. I know it's not supposed to happen, but I see it all the time.Keep in mind that the pressure trying to keep the nozzle coupled is fighting against the nozzle return spring, the friction in the seal, and whatever mechanical force pushing in any direction other than a perfect straight line
In most GBBRs the initial puff of gas is more than enough to cycle the bolt, albeit not optimally. Some even work when you disable the valve locker, which is the awful trick that Poseidon uses in their Turbo Valve
shims to reach a gazillion shots per fill, coupled with a piston head that barely seals, and therefore allows the nozzle to disconnect WAY earlier, as otherwise it wouldn't feed with such a pitiful travel. They deliberately cause the issue and market it as a science-defying miracle.
Keeping a good coupling between the nozzle and the hop chamber is the third most important thing for a GBBR, right after keeping a good connection between the gas route and the nozzle input, and specially, having the best seal between the nozzle and bolt carrier.
And no, you don't NEED a Maple Leaf bucking to achieve that. Many other good buckings will do in many guns. And you definitely don't NEED the ring in some guns, heck even I run it ring-less in the VFC M40A5, as otherwise it causes jams.
What I'm saying is that their buckings are the only ones that actively address that issue. And that's why I stick to them for any GBBR