Originally Posted by fupuk
Very nice everybody, I have a quick question for everyone. I found stripped lowers locally, on armslist for sale. The company's name is Aero I went to the manufacturers website to check out the part and it says its a multi caliber receiver? I know its an Ar15 receiver but I dont know what are the other standard calibers for it?
A list pulled from Calguns.net..... It'll make your head spin!
AR-15, without bolt modification
.222 Remington Magnum
.223 Remington (5.56x45mm)
.223 Remington Ackley Improved
.300 Whisper (.300/221, .300 Fireball)
AR-15, with bolt modification
5.45x39mm (.21 Genghis)
6mm BR Remington
.30 Herrett Rimless Tactical (6.8x43mm case trimmed to 41mm and necked up to .308; the 6.8mm version of the .300 Whisper)
.35 Gremlin (necked up 6.5 Grendel to 358)
.358 WSSM (various names, but all are some form of a WSSM necked up to 35 caliber, some are shortened to make them big game legal in Indiana)
.50 Action Express
AR-15 using a simple blowback operation
41 Action Express
45 Win Mag
This list is in no way complete.
This list does not include complete different uppers like the FN 5.7 or the one that shoots .410 shotgun, crossbow bolts or bolt action uppers like the 50BMG
(credit to melensdad from oa2.org for the list)