Étape 4: Lanceur de PTC
http://knexinnovation.net/showthread.php?527-ZKAR-zak-s-K-NEX-Assault-Rifle&daysprune=-1
http://knexinnovation.net/showthread.php?542-zak-s-bolt-action-ZKAR-follow-up
http://knexinnovation.net/showthread.php?527-ZKAR-zak-s-K-NEX-Assault-Rifle&daysprune=-1
http://knexinnovation.net/showthread.php?542-zak-s-bolt-action-ZKAR-follow-up