Not only is the AR15 the most accessorized firearm there is, you can change the barrel lengths and even the calibers by pushing two pins out.  Sometimes a hammer spring or recoil spring needs to be replaced but that about it.   I would suggest that someone buy multiple uppers for one lower but the beauty of the AR15 is that if you want something else and are happy with most of what you own, you might just want a new  upper.  For instance if you are use to using an AR15 for self-defense or for training, but you want to do longer range shooting and are lucky enough to find a State where you can varmint hunt with an AR15, all you need is a different upper and you can reach out with a 20+ inch upper.

There are better calibers for varmint hunting but many people think that you need a 22/250 to hunt ground hogs or prairie dogs.   One nice thing about our AR15 complete upper receivers for sale at Rogue Elite is that you can practice hunting with your military style rifle.   You may have some adjustments to make to the stocks you are using especially if you are using larger optics, but once you’ve zeroed your scope in and if it’s properly mounted, you won’t have to sight it in again even if you pop out the lower.  Some upper receivers perform quite well even with shorter barrels.  My LWRC M6A2 16″ barrel is varmint accurate with the right ammo out to 400yds.