To oppose perfectly Constitutional firearm regulatory measures is not to ‘advocate’ for the Second Amendment
True, but no one is doing that.
What we oppose are unconstitutional regulations that violate our civil liberties (and worse, that violate our civil liberties for no reason).
To advocate for the Second Amendment is to support Second Amendment jurisprudence,
Only in such cases where the jurisprudence is legitimate. If some court rules that it is OK to to disregard the Constitution, it is OK to oppose that ruling.
to acknowledge the fact that the Amendment is not ‘absolute,’
That is not a fact. If a law conflicts with the Second Amendment, that law is unconstitutional.
and to acknowledge the fact that government has the authority to place limits and restrictions on the Second Amendment right consistent with that jurisprudence.
Limits and restrictions consistent with the Second Amendment itself.
Again, if some court rules that it is OK to disregard the Constitution, it is likewise OK to oppose that ruling.
Indeed, conservatives’ hostility toward Second Amendment jurisprudence renders them opponents of the Second Amendment, not ‘advocates.’
No such hostility on the part of conservatives. It is progressives who are always complaining about the Heller ruling.
The Supreme Court has never ruled on the Constitutionality of magazine capacity restrictions
Yet.
But now that they are starting to enforce the Second Amendment, that moment is coming sooner than you might think.
absent such a ruling, magazine capacity restrictions are perfectly Constitutional and do not violate the Second Amendment, consistent with the doctrine of presumed Constitutionality (see US v. Morrison (2000)).
That is incorrect. Unconstitutional laws are still unconstitutional even if the courts aren't striking them down.
That a law might be flawed and ineffective – such as high-capacity magazine bans – doesn’t make the law un-Constitutional.
What makes the law unconstitutional is the fact that it violates our civil liberties.
Because magazine capacity restrictions are consistent with Second Amendment case law, and don’t violate the Second Amendment, to advocate for magazine capacity restrictions is to likewise advocate for the Second Amendment.
Magazine capacity restrictions do violate the Second Amendment unless they are loose enough to allow 20 round handgun magazines and 30 round rifle magazines.
Advocating to violate the Second Amendment is not advocating for the Second Amendment.
What you and others on the right might ‘think’ or ‘feel’ about magazine capacity restrictions is legally irrelevant;
That is incorrect. Violating our civil liberties is against the law.
that you don’t like magazine capacity restrictions doesn’t make them ‘unlawful,’
What makes them unlawful is the fact that they violate our civil liberties.
and places you at odd with Second Amendment caselaw and the Amendment itself – that’s not ‘advocacy.’
That is incorrect. Opposing violations of the Second Amendment does not place me at odds with the Second Amendment.