I admit part of the problem is being a lefty and the Steyr has the cocking handle on the wrong side too far forward. Not a problem on an AR or SLR with the handle well back on the reciver. As far as Steyr reliability it seemed to depend on your luck with your issued rifle. I had jams with both blanks and live ammo but poorly loaded mags may have contributed as well as sand/volcanic ash/dirt etc. Some of the Australian made ones were not too good, a friend messed his hand up pretty bad when the plastic cocking handle broke exposing metal.
Can't vouch for the ACR or other American designs but so far my experience is that even the cheap ARs tend to work well with minimum maintenance and jams. I have only had issues with brand new rifles being a bit tight. Apparently some of the cheap 5 shot mags can cause problems also.
I am a bit wary of the idea of an AR with an aftermarket piston setup. No personal experience but read lots of negative comments and would be concerned about the receiver as it is alloy.
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