1st things 1st, make sure barrel is unobstructed, firearm is EMPTY.
2nd thing...make sure NO AMMO is around (oops you seasoned shooters missed that one! {we'll keep that as a secret between us
} )
Read manual. Re-read assembly disassembly instructions i.e. ''field strip''
Carefully inspect exterior, interior of firearm, field strip, inspect separated components in same fashion during strip.
Carefully look at separated parts and make mental note, this looks like ...''...'' , the fat end of the recoil spring goes that way, etc
If firearm has multiple detachable magazines versus internal i.e. a cylinder or tube, number the external mags somehow. Most modern autos errors are magazine related, but, which one was it again?
Do a basic cleaning of the gun, lube as per specs in manual...then dry fire. Feel the trigger, where does it break over, etc. This is where you find things out like,Oh lookie, the firearm will not fire without a magazine inserted. Yes I remember that was on pg 8 of the manual...
Do whatever , shoot, store, collect..whatever
OK you carefully inspected the firearm(s), and, once at the shooting area something goes wrong. Or did it? There is now a discoloration on such-n-such, or is there? Other examples e.g. mag safety, nope, it's not broke hehe. Yes there is/is not...
because you remember the basic condition of the firearm, while handling it administratively.
You have a comparison. After firing, field strip and reinspect for obvious damage that may indicate a manufacturing error, cracks, shaved spots, rub marks etc. Again, you have a comparison, before and after firing.
More times then no, someone at the range is stuck, their firearm isn't doing XX, did you read the manual, do you have it with you, do you know how to field strip, answers are no,no,huh,whaat? FORTUNATELY with the internet available there is a fix
Enjoy that firearm...that you KNOW how to utilize correctly, safely. Take a kid shooting, don't tell Mom about the coffee hehe