The original Declaration of Independence uses the word unalienable. Grammarists will argue that inalienable and unalienable are one and the same; they're synonyms.
Second Amendment rights are not among the enumerated unalienable rights.
An unalienable Right cannot be bought, sold, traded, forfeited, given up or with-held. It is literally above the law.
The unalienable rights enumerated in the Declaration of Independence are life, liberty and the pursuit of happiness, any one or all of which can be forfeited, given up, or withheld. Pretty sure anyone sitting in ADX Florence would agree with this.
Your definition of "unalienable" is seriously flawed.