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at first, sorry for my bad english (I'm Ukrainian)

AK-74.  

- Reliable due to design.

- The gate group and the trigger are not very polluted.  

- Relatively low accuracy due to the shifted center of gravity of the bolt group.  

- Strong vibrations due to excess energy transmitted to the shutter. 

AR-15: 

- High rate of fire.  

- High accuracy due to the soft shutter speed (let's call it that).  

- Small barrel popping, as the shutter stroke, butt tube and barrel are in the same line. Cons 

- The gate group and USM are heavily littered.  

- The gas pipe is a vulnerable unit (although the continuous shooting before the AK-74 and AR failures is about the same, 950+ shots, but who the fuck will water this way continuously?) 

- The butt pipe is a functional unit, which means the butt is not removable (take a short barrel and do not fuck yourself). 

 AR of a smart person (HK416 and other piston ones) 

- A reliable piston system with a gas key (by the way, it looks more like a system from SVD than from AK-74).  

- The gas key allows you to adjust the amount of gas supplied to the piston (by the way, explain to me who fumbles how the silencer on the arches affects the exhaust system). 

 - The bolt group does not litter.  

- And the other pluses of the AR. 

- A slight skew of the bolt frame (the issue is resolved by the conical shape of the back of the bolt frame, but still there is a bit)

 - Expensivе