銃 (つつ) Japanese meaning | KotomoraWritten forms
銃
Archaic kanji form for 'gun'; now normally read じゅう. The reading つつ is historical.
砲
Alternate archaic kanji, originally referring to cannon or artillery pieces.
Etymology
The native word つつ originally meant a tube or hollow cylinder and was extended to tubular firearms; 銃 is a later meaning-based spelling.