Ruger Carbine convertible

[harley08]

Does any own a Ruger Carbine that cane with two barrels (.223 and 300 blackout)?
It came in a nice carry case with room for plenty of mags.
I own one and was wondering how many are outers have one?
(Looking for US M1 Carbines)
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[chet15]

They didn't come with two barrels originally. But you could order the Blackout barrel I believe as an extra.
Chet15

 

[Mobuck]

Changing 'barrels' isn't as easy as changing revolver cylinders.