Every guns jams. That's just fact. The main selling point for the SCAR is ultra reliable, which it is not by many accounts. Two double feeds within 200 rounds from each other is unacceptable. Again double feeds take a lot longer to clear and you lose a magazine in the process.
AR15 is mechanically simpler then the SCAR, AK or any overhead piston rifle. It has at least one less part then piston rifles. In the AR15 DI the bolt is the piston.
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