This little hornbook affords that reader some of the most vital pieces of information respecting gun law and armed defense. Primarily, it contains decisional case law on the matter of lawful self-defense; it thus, primordially seeks to uphold nothing but lawful self-preservation in certain extreme situations that may comprise life-and death scenarios. It also features a straightforward black-letter primer on the provisions of Republic Act No. 10591, as amended, pertinent subordinate legislation thereon, and edifying educative jurisprudence. The enactment of recent statutory amendments, and the newly modified implementing rules thereon is the primary mover that produced the impetus of writing this piece of legal literature.