modified firearm meaning in English

修改的火器

Application for permission to use modified firearms and blank ammunitions for location filming
申请拍摄时使用改装枪械及空弹
And submit to pprb three working days prior to the intended filming of every scene with details of the date , time and location , details of modified firearms used and their users and estimated number of shots fired
，列明每个场景的拍摄日期、时间、地点、所使用改装枪械及使用者的资料，以及预计发射子弹数目。
Location filming in public places does not generally require permission from the government , except when the filming is going to take place on property under government control , or when resembled uniform or accoutrements of the government forces , modified firearms & blank ammunition , road closure and special effects material to create special effect for filming are being used
外景摄制工作在公众地方进行外景摄制，通常无须取得政府批准。但若拍摄工作在政府产业或其管理范围内进行，又或牵涉使用仿造的政府部队制服或装备、改装枪械及空弹、封路以及制造电影特别效果的特别效果物料，则属例外。