Starting to see a bunch of modular rifles on the market. most have gas piston systems such that it is easy to swap barrels (thus calibers).
Beretta is putting the ARX100 on the market. It has both a 5.56x45 barrel and a .300 BLK barrel available. http://www.americanrifleman.org/blogs/beretta-arx-100/
Faxon Firearms (http://www.faxonfirearms.com) has introduced the ARAK-21 upper in 5.56 and 300 BLK.
The IWI Travor bullpup is also capable of being a modular rifle as its barrel is easily swapped out. http://www.iwi.us/travor
And Lewis Machine Tools (http://www.lmt.com) has a AR10 system that is modular.
Beretta is putting the ARX100 on the market. It has both a 5.56x45 barrel and a .300 BLK barrel available. http://www.americanrifleman.org/blogs/beretta-arx-100/
Faxon Firearms (http://www.faxonfirearms.com) has introduced the ARAK-21 upper in 5.56 and 300 BLK.
The IWI Travor bullpup is also capable of being a modular rifle as its barrel is easily swapped out. http://www.iwi.us/travor
And Lewis Machine Tools (http://www.lmt.com) has a AR10 system that is modular.
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