Every one of the models has one or two particular faults. How easily, quickly, simply it can be repaired is the key. Note, they'll all wear...but most are good for thousands of rounds. Each models have their own pros, cons, likes, dislikes....same as if the rifles were electric. So the following doesn't get into that...more the common issues that come up.
In general...replacement stock pieces are cheap...and easy to get, especially the M4
M4
. First gen mags leak...gasket seal...cheap, easy
. Nozzle may break on jams...swap in new nozzle, easy...drop in a spare bolt with nozzle, fast and easy
G36
. Charging handle can snap...harder to find replacement
Ak
. Heavy bolt is really hard on the parts.
G36
. Back receiver plate breaks...replace with metal one
. Lower receiver is plastic...flexes and moves from upper...causes firing issues. It takes time for it to evolve, but once it does, it's not fixable
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