I've never thought of having three ARs of the same configuration was too extreme of a view, as others have stated it's a great insurance policy. I'm not sure how the SBR aspect becomes an issue for out of state classes. You generally schedule those classes well in advance, yes? Meaning you have plenty of time to give the boys at the No-fun Bureau plenty of notice for when you are want to take the SBR out of state.
The other side of this is issues you really could run into that would take your AR out of commission in circumstances you would want to get it back up and running quickly.
Sheared bolt lug: If you keep and accurate round count you should have an idea of when that you want to swap out the bolt.
Failed extractor: Again keeping a firing schedule and replacing failing components before the go TU.
Ripped case head: Use quality factory loaded ammunition during defensive scenarios, or pay very close attention to your brass and dispose of it after a certain number of reloads.
Blown Primer or primer falls out: Again quality ammunition, or dispose of brass that the primer pocket has gotten to easy to seat a primer into.
Ka-Boom: Quality ammunition, or pay critical attention to make sure you aren't dropping pistol powder into your reloaded 5.56.
Blown barrel: Quality Ammunition (beginning to see a trend?) or weigh every single reload to check for extreme weight variances.
Shot out barrel: Barrels can be funny things in how quickly they go but again, keep an accurate round count and replace when you hit a certain point of the groups opening up.
These are just some of the more common things you can run into if you shoot and shoot frequently. If you do proper maintenance at appropriate round counts, use quality ammunition, and use magazines you've certified to function flawlessly with that rifle. Your failure incidence will be low. Having that secondary rifle just becomes your Backup Quarterback in the NFL.
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