[Eagles6]

No. Quite easy to kill yourself with a rifle. The diminutive Japanese of the WW II Era became quite adept at doing it with an Arisaka almost as long as they were tall by sticking the muzzle under their chin and pulling the trigger with their big toe.

[Myrddin]

a·dept adjective əˈdept/ 1. very skilled or proficient at something. "he is adept at cutting through red tape" synonyms: expert, proficient, accomplished, skillful, talented, masterly, masterful, consummate, virtuoso; More antonyms: inept noun noun: adept; plural noun: adepts ˈadept,əˈdept/ 1. a person who is skilled or proficient at something. "they are adepts at kung fu and karate" synonyms: expert, past master, master, genius, maestro, doyen, virtuoso; More antonyms: amateur Origin mid 17th century: from Latin adeptus ‘achieved,’ past participle of adipisci ‘obtain, attain.’ Translate adept to Use over time for: adept

An act performed precisely once is hardly worthy of adept. Nobody has a resume touting "professional suicide bomber". It's an oxymoron. Schrödinger's cat might have a shot at it.