Quote:
Originally Posted by Supercharged SS
Thanks guys. Why is everyone in need of lowers? Seems like the one that comes with the gun should last forever, no? 
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I own an AR15, and I ask the same question! But for a different reason.
The AR15 is a modular concept rifle. You can change calibers easily and without gunsmithing, by swapping in different uppers. It's stoopid-easy. The AR15 is sometimes called the 'barbie doll for men' but I think it's more like a lego set
But what many people do is buy different lowers for different dedicated builds with different barrel lengths, calibers, etc. My personal preference would be to use one lower and take advantage of the modularity