I definitely see where that line of thought is coming from. I myself had planned to use a gun as a backup method, but then after careful deliberation saw that a nitro rig was objectively the better option (even in terms of $ cost, if $100 more-or-less is no issue). Without going into a longer explanation I would still have to err on the side of caution. If in fact one is "determined" to use a firearm like I was (likely the highest-risk method out there, due to its unpredictable and volatile nature), it is in their best interest to acknowledge that: this arbitrary method is [as a matter of fact], devoid of sense or reason (given the serious consequences if failure occurs), and look elsewhere, --carefully weighing the facts (right-to-die organizations/euthanasia science). This dissenting view is definitely warranted with regards to firearms, so I'll just present the gist of it here. It's quite the moral dilemma when issues like these arise...