Piston big bump, the M16's extractor retaining pin broke on me in the field at dusk. It wouldn't extract. It wasn't a good night. I haven't liked gas impingement since. JMHO
I too expected Murphy at every corner and carried a spare upper that was scoped and halo’d in 3 gun match style for long 800 plus yard shots if they need to be taken at all. Most of us carried an entire spare bolt assembly as well as a lower rebuild kit of pins, parts and springs, c clips etc . We had that liberty to do such as does civilians these days .
Were I to have to return to service and get my choice of service rifle. It would be a Hk 416 in 6.8SPC with a M203 attached. IMHO hand down current best available service rifle combination to have for EVERY troop.
Everything man made is fallible .......:o)
Isn’t that complaint akin to “the brakes are shot, so I made your horn louder”? How does a broken extractor demean gas impingement?