No person shall be held to answer for a capital, or otherwise infamous crime, unless on a presentment or indictment of a grand jury, except in cases arising in the land or naval forces, or in the militia, when in actual service in time of war or public danger; nor shall any person be subject for the same offense to be twice put in jeopardy of life or limb; nor shall be compelled in any criminal case to be a witness against himself, nor be deprived of life, liberty, or property, without due process of law; nor shall private property be taken for public use, without just compensation.
This implies that a person (not just a citizen mind you) *can* be deprived of liberty with due process. With "liberty" being defined by the BoR, any of the amendments might conceivably be affected, not just the 2nd.
I'm thinking that I may have been misunderstood as well regarding "felons". I did not mean to imply that a felon should be denied his/her 2ndAmdt rights for the remainder of his life, merely for the duration of his sentence. If, otoh, he is sentenced to "life without a gun" then that would be a different story.