When I enlisted and reenlisted in the military, I was not given the option of indicating the parts of the Constitution I would or would not support. I also was not given the option of indicating which people or ideology I would not protect.
Essentially, I serve to protect everyone whether they like it or not.
The NRA and other like minded organizations protect your gun rights whether you like it or not.
When you enjoy the freedoms and condemn the guarantor, you are an ingrate.