https://en.wikipedia.org/wiki/Steyr_AUG
LARPfag here. The StG77 is the only rifle I know, but I can't believe you can ask for more.
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Look through telescope
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Put center of crosshairs over target
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Pull trigger
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See target pop
Muzzle velocity is 970m/s -- no imagination or mental acrobatics required for targets closer than a hundred yards. Aim a palm or so higher for each extra hundred yards. The rifle is mostly made of plastic and absolutely no burden, not even on 30 ml walks. Careful cleaning is a requirement for automatic action, though, especially for and after using blinds.
How does that compare to U.S. army rifles? Or a Kalashnikov? A problem for guerilleros might be that all parts are machine-tooled, so you need special equipment for making spares.
Cheap AUG part kits were available for awhile there, if you were into AUG's it would've been worth it to pick up a few for spare parts
You US-killers are living in an arms paradise. I doubt that I can buy spares just like that in my country (Austria), although it has fairly libertine gun-laws when compared to Germany. (I keep hearing that folks on the Austrian countryside often have large illegal arsenals at home, including weapons of war. Cops are into it, too, and turn a blind eye. That's the Austrian way: strict laws, non-strict enforcement.)