This whole "AR-15 is not DI because it has a piston" fad seems like a meme...

This whole "AR-15 is not DI because it has a piston" fad seems like a meme. It's so poorly defined based on this premise that you can roll all DI guns into the piston category as well based on this premise.

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For example, here's an undisputed DI gun, the AG42. You can see there that on diagrams it is acknowledged as a piston.

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Gas is directly pushing the bolt. In the case of the AR-15, it is pushing both the bolt and the carrier apart.

Ergo it is Direct Impingement. It doesn't matter which way or on which side the gas is pushing; it is touching the bolt / carrier either way.

There's some discrepancy on which part should be considered the piston, but number 8 on this diagram is the "gas tube bushing" that extends the gas tube, increases the diameter, and acts as a stationary piston in a similar sense that the AR15's bolt is a stationary piston.

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This is my thought exactly. The existence of a piston should not preclude it from being DI. The key word is "direct" in direct impingement, as any force used can be defined as a sort of impingement.

Side view of the system. Note the deliberate design decision to increase the diameter of the gas tube bushing for better efficiency as a piston.

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The cup on the bolt goes into a recess around the "gas tube bushing" and acts as an expansion chamber, just like on the AR-15. This is also a sealed expansion chamber which refutes the argument that the AR-15 is a piston gun because it has a sealed piston. This does as well.

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Are you Chesnokov's swedish relative?

The Soviet composer?

The AR-15 is a long-stroke gas-operated assault firearm

I dunno about assault, but yes, and also direct impingement.

Didn’t you make this thread last month? We get it. The AR15 is DI.

There is some real weapons grade autism ITT.

I was in that thread. I'd take actual firearm mechanics discussion over the third daily /arg/ anyday.

The reason for this is because the old French DI was an incredibly crude operating system, about as simple as gas operation can possibly be. ARfats think their rifle is too high brow now for that kind of primitive heritage and so try to distance themselves.

This. Also to try to dab on HKfags on their HK416

416s dab on themselves with those bolt velocities

HK's dabbing on FN and other AR manufacturers with the M27 though.

>dumb Marine gun
>not an evolutionary dead end
With no plans to buy more and the army looking elsewhere, the m27 is just going to end up in the garbage bin of trash piston ARs.

The army is looking elsewhere because a generational jump over to telescoped ammunition is more worth the money, plus the marines have set a higher bar to jump over now.

It's not a dead end when its their new service rifle. Maybe comparatively short lived if they follow the Army with their NGSW eventually, but there's no question that HK got the last laugh of that era. The M27 is just a midlength 416 after all, and the 416 is used by quite a few HSLDs around the world.

It's A new service rifle. They've only purchased 15,000 with no plans to purchase more, and there's about what, 22,000 combat infantry Marines? And they're probably not going to field all of them either.
At this point, everyone's masturbating over the new LMTs that NZ and the UK are getting more than the M27.

any slow motion webms of the DI system in action?

Besides the MAS and AG42 and Hakim, what other DI guns even are there?

It's an attempt by HK to shill their piston driven ARs into not seeming as a downgrade, when in reality they are.

But people generally think of pistons as an upgrade

yeah and why do you think that is?

Because pistons work better with suppressors.
Special Operators use suppressed rifles.

Muh AK

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gunmaker propoganda and it's different from the standard (despite the standard being better)

>Long-stroke piston
>Tappet
>Conventional DI
>AR-10's "DI"/"coaxial piston"/whatever
Anyone who can't see there's (at least) four distinct categories of gas-operated action, with differences big enough to be worth noting, is retarded.

Anyone who recognizes the four categories, but has STRONG FEELINGS about which ones get called "DI" vs "piston", is a raging faggot.

Those are subcategories of what people are talking about

>It's so poorly defined based on this premise that you can roll all DI guns into the piston category as well based on this premise.
AG-42 wants a word.

The carrier is the mass that moves, and the bolt still locks and unlocks when the carrier moves with the gas turned off, so you cannot say that it is piston driven.

I think the OP pretty clearly explained how the AG42 would be rolled into the piston category

>The existence of a piston should not preclude it from being DI.

sure is summer in here

Lots of them just cant picture a piston having more than one function. It's just Dunning-Kruger in action.

>DI
directly impinges on the action
if there is anything between the action and the gas used to put it in motion, it's not DI

how is this difficult to grasp?

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what is the point of this post? to demonstrate that there are retards on Jow Forums?

Probably to demonstrate that the people that watch FW are retards

It doesn't have a piston. The bolt carrier acts as the "piston" itself, that's what the gas hits and gets moved back to cycle the action. A bolt carrier is not a piston, and that's not where you want your hot/dirty gasses going. It saves weight but is indeed not a reliable design unless you lube the shit out of it or clean it after every few hundred rounds.