(03-07-2018, 09:08 AM)B2hibry Wrote:

(03-06-2018, 07:26 PM)MyBloodIsTeal Wrote: It's not semantics, the AR-15 can be configured in multiple calibers.  That's one reason it is so popular with hobbyist, it is very versatile.  For example I can take any one of my AR-15 lowers (bottom half of the assemble and add an upper in a different caliber and its still an AR-15 shooting a different round.  The lower which is technically the gun and contains the serial number and the upper receiver are standard parts across all AR-15s.     Depending on what caliber your running you put on a different barrel, and possibly a different bolt carrier group, and magazine.  A lot of people will buy one lower and several uppers in different calibers.  For example I could have a .223, .223 Wylde, and a .300 Blackout upper and only one lower and change it in seconds with the takeout pins.

There are legal limits however on how you can configure your AR.  For example if you build a AR pistol with a 10 inch barrel you cannot put a shoulder stock on it.  If you build a rifle you cannot have a barrel under 16 inches unless you have a Federal Tax Stamp for owning it.   It is truly the swiss army knife of guns, there are so many combinations to suit the needs of a wide spectrum of shooters.

Yes, the AR platform...not AR-15 model. Same could be said about the AK platform or Remington 700 platform.