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.
Interesting, because I guessed that that's better for absorbing the recoil. (As far as I remember recoil was a non-issue with the AUG/StG77, at least while lying on the belly.)
makes sense.