Flashbacks. Thanks to Tamara, I'm having them. Weaponsman's fault, mostly.
I once had an M60 machine gun that wouldn't fire. I lost track of all the way some genius had found to reassemble it with all the parts -- no "spares" left over -- most of them inserted incorrectly. The hammer was installed backwards and upside down, the gas cylinder was backwards, the trigger group pins were inserted backwards, and the leaf spring was on the wrong side and upside down...
If it had been Basic Training I'd've suspected a test of some sort.
My loathing for the M60 machine gun knows no bounds, since, in addition to the above incident, it has to be held together with baling wire. Well, they'll tell you
Also, R.I.P. Weaponsman.
(Edited to add the point about the hammer.)