(うちあう) (v5u,vt) to exchange gunfire; to exchange shots [EDICT]
じゃ
() (aux-v) (sl) (contraction of じゃない) isn't it [EDICT]
() (aux-v,v5u) (contraction of ..て or で plus しまう) to do something completely [EDICT]
無い
(ない) (adj-i) (1) (uk) (See 亡い) nonexistent; not being (there); (2) unpossessed; unowned; not had; (3) (See またとない) unique; (4) (as ...ことがない, etc.) indicates negation, inexperience, unnecessariness or impossibility; (aux-adj) (5) (See ない) (after the ren'youkei form of an adjective) not ...; (6) (after the -te form of a verb) to not be...; to have not ...; (P) [EDICT]
の
() (prt) endorsing and questioning the preceding statement (sentence ending particle); lamenting reflections on the preceding statement (sentence ending particle) [EDICT]
() (prt) (1) although; when; and yet; despite this; in spite of; even though; but even so; but even then; however; nevertheless; for all that; notwithstanding that; (2) while; (3) if only; I wish; (4) I tell you; you should do; (5) in order to; (P) [EDICT]