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Makes things worse 9 times outta 10. "This will force the bolt closed so I'm gonna do that even if it's not the right thing to do when gun not go bang."

It's only there because retarded Army grunts wanted a button to push in case things went wrong. A solution in search of a problem, really.

Because sometimes you have to dig while shooting, so it helps to have a spare.

Check this guy out, the original page is down where he documented his work in detail, here is a link with a brief overview. He made an ak out if a shovel. He dubbed it the shitshovel ak.
https://www.thefirearmblog.com/blog/2012/11/26/turning-a-shovel-into-a-ak/

Og link
https://everydaynodaysoff.com/2012/11/27/shit-shovel-ak-47/

In this context, stamped or machined typically describes how the receiver was made.

Stamped is pressing or rolling sheet metal into the desired shape. This is cheaper, and the parts are made with less precision.

Machined is when you carve something out of a block of metal. It's more expensive, but the parts are usually stronger, more precise, and more durable.

It's a reference to the fact that AR receivers are machined out of blocks of aluminum while AKs are stamped out sheets of steel peeled from the sides of German Tiger tanks. (I may have made up the part about the Tiger tanks....)

That is an AK which is machined, they are first gen AKs. Most AKs you see are actually AKMs which are stamped, those have the funny looking diagonal cut on the front of the barrel (it's a very basic compesator). Machined means you take a block of metal and carve it out, essentially. While this makes sturdy receivers, they are also heavy, expensive, wasteful and wear out tooling.

So AKMs are stamped, where a thick sheet metal is pressed into shape by a hydraulic press. Then they are riveted/welded to the rest of the parts, which are machined. This was better cost wise and still retained most of the strength. It was also lighter. The thing about war guns is that they need to be cheap so they can be made en masse and quickly. Most guns outlive their operators in war and don't get to fire many rounds before they end up in the dirt besides them. They didn't need to be amazing quality.

Before the AK it's true that some guns weren't that great durability wise, like the SVT-40 and Gewehr 43. Those tore themselves apart. They cracked receivers because they weren't built strong enough for the full size cartridge coming from the Mosin and the KAR 98. Then they switch to intermediate cartridges which made those guns obsolete anyway. The full size cartridges were not really necessary as most engagements occurred at shorter ranges, so that's how we got the intermediate cartridge. More recently I hear the US went back to a bigger cartridge as in Afghanistan they were getting into longer range firefights and body armor got better.

The AR is indeed machined, but it's machined from aluminum. It's not really stampable and the aluminum is soft enough to not wear out tools so much. But it's a completely different gun, the manufacturing method has a lot less to do with anything rather than the design. Round for round I don't actually know which will last longer but I would put my money on the AK, mostly because it's made of steel. I think the aluminum receiver on the AR wears out quicker. So I think the AKM even though it's stamped, will outlast an AR.

The gun sites all insist it wasn't copied from German or US design..and completely original.
(but same gas system, rotating bolt, etc.)
The PKM slowed down rate of fire and extended barrel length to almost match the STG-44.

Like an ICBM isn't copied from a V-1. History is what it is.

Without going to check, I'm 99% sure the SKS I lost in that boating accident was milled. Heavier of course, but a much more robust rifle than the AKs I lost in that other boating accident. None were hitting anything at 500 yards

Mine's a 50s Romanian with blade-style bayonet. It'd be worth quite a bit if its beautiful red stock didn't have a crack. It's cosmetic though; still a great shooter. It'd probably fetch 5-600. They're not $99 barrel guns anymore, but good ones can still be bought reasonably, with some variants fetching vastly higher prices.

The VZ-58 has a short stroke gas chamber making it much more accurate than an AK and it's Czech made. There are a few videos out there comparing the 2.