And there is more to an AR rifle/pistol than just that one example. As rjrivero said, you can then transfer your skills and muscle memory to all of them. Does anybody really have a 9mm AR and not have other ones as well?
In my case, I like to setup all my AR's the same. So once I built the 357 SIG, I upgraded it to my "standard." Same pistol grip, same SSA trigger, same sling mounts, same selector lever, etc, etc. So I end up with a rifle that really does feel and handle just the same as my "more serious" AR's. With a match trigger that just dropped right in. And my large store of spare parts can be used with any of them. I'll grant you... it can get expensive. I've got more than one AR that ended up costing me more in aftermarket parts than the base rifle did. Brownell's loves me!
Gregg
In my case, I like to setup all my AR's the same. So once I built the 357 SIG, I upgraded it to my "standard." Same pistol grip, same SSA trigger, same sling mounts, same selector lever, etc, etc. So I end up with a rifle that really does feel and handle just the same as my "more serious" AR's. With a match trigger that just dropped right in. And my large store of spare parts can be used with any of them. I'll grant you... it can get expensive. I've got more than one AR that ended up costing me more in aftermarket parts than the base rifle did. Brownell's loves me!
Gregg