Direct: without intervening factors or intermediaries

To all the retards in this thread, the term is actually DGI, or direct GAS impingement. The GAS directly impinges on the bolt carrier.

Jesus you fucks are autistic.

No.
Stoner's system is using the expansion of the gas aagainst a piston to run the action.
DI or DGI as you are calling it is using momenmtum of a stream of gas to strike the carrier and force it back. This is the system used in the Hakim, Rasheed, MAS, and Ljungman rifles. You can exactly duplicate the action of the gas with a small hammer in these rifles.

its an internal piston
the bolt itself is a piston
people who advocate for piston-ars outside of a few very specific niche reasons fundamentally misunderstand the rifle and are gimping their rifle for a meme

Attached: .jpg (543x900, 50K)

Jesus that is a terrible diagram.
People don't buy into this trash, do they?

An AR15 bolt is a piston in an engineering sense, in that any close fitting reciprocating mass pushed by a liquid or gas can be called a piston. For the purposes of firearms nomenclature it's direct gas impingement, because by Stoner's autistic patent getting wank terminology literally anything can be a piston. The gas rings so many people like to point out as proof are there because of Stoner's obsession with keeping the entire action inline, it serves no other function than that. I will concede it allows the system to function with far less gas than a "traditional" DI because the gas is now directly impinging against two surfaces. For an example look at the vast majority of piston conversions, the carrier is essentially standard with an impact surface replacing the gas key. Given an appropriate volume of gas a plugged key would too.

Are the little swirls supposed to be gas? If so, they are on the wrong side of the rings.

delay mechanism so the chamber doesnt open too soon

Or are European and are promoting a proprietary product.

i have a meme - that one day manufacters will rise up and standardize there meme component manufactering

i have a meme that one day on the red hills of georgia, sons of HK corporate executives will manufacter cheap HK proprietary parts

i have a meme that one day even in the state of mississippi, a CHL from anystate will allow me to CC, since open C is for fags

>The gas rings so many people like to point out as proof are there because of Stoner's obsession with keeping the entire action inline
Dunning-Kruger in all its glory.

>muh Dunning-Kruger!
>u so dum
>nothing else
Do go on

Piston is superior for reliability.
/thread, horse is dead.

>being so autistic that you have to add a piston to a gun that already has a piston

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wow it's insignificantly more reliable and 'cleaner' while adding more moving parts and non inlined recoiling mass; directly opposed to the guns design

>moving parts
Irrelevant.
>recoil
>5.56
S O Y

so we should make a rifle worse because of a bean?
I'm talking primarily about full-auto controllability btw

moving parts out of line with the barrel is not irrelevant, its a vital design feature of the rifle. It's the little details that make a great design; which is why people can produce bad firearms even today when we have centuries of understanding and experience with their mechanics. Even a slight ergonomic problem or tiny mechanical issue can soil a design and turn it into trash, nothing is 'irrelevant'

>moving parts
Irrelevant. Full auto by nature isn't accurate, only single shots matter for accuracy.

DI is actually better, but it being better just doesn't matter to you?

uhh okay lol

ur momma likes hot fluids pushed into her moving parts

Because it's cheaper and more compact than a roller locked system. With rollers you neede to keep the entire barrel suspended on springs which means it can drift off of where the sights are zeroed, The rollers also take a lot of wear and tear that you can't solve with a cleaning kit.

>>direct: without intervening factors or intermediaries
>>impinge: to thrust forcibly
>>direct impingement: a fire-arm action which uses propellant gas to push the bolt without an intermediary part, such as a piston
>>Hurr durr the bolt is itself a piston!

The inside of the bolt carrier group and outside of the bolt are an expansion chamber. The bolt carrier isn't hammered back by the gas, it's more gradually pushed back away from the bolt as the gas expands into the chamber.

In a way, it "smooths" the bolt opening.

>To all the retards in this thread, the term is actually DGI, or direct GAS impingement. The GAS directly impinges on the bolt carrier.
>Jesus you fucks are autistic.

The gas directly impinges on the interior of the bolt carrier and exterior of the bolt in a special chamber that directly impinges it to expand apart until the bolt has opened and vent holes bleed off the rest of the gas.

So, it's not like normal gas impingement where it hits one surface and causes pressure mainly along a single axis, it expands in a chamber and the expansions produces motion in a parallel direction...

Gas can't bend, weaken or break.