To legally put a 14.5" barrel on your AR-15, you need to register it as a Short Barreled Rifle with the BATFEIEIO. This will cost $200 and require some paperwork, fingerprints, and a sign-off by your local CLEO.
I am not sure that California allows ownership of SBR's other than C&R.
Purchase of the barrel itself is not regulated, however ownership of the barrel and a non-papered AR could, if they were in a cranky enough mood, be construed by the feds as being in "constructive possession" of an unregistered SBR, which is a federal felony.
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