Standard 31rd magazine for Tokyo Marui HI-CAPA 5.1 Match Custom. Also suitable for 4.3. Full metal construction for durability. IF you are going to use this Hi Capa 5.1 Match Custom in IPSC situations where you drop the magazines onto the ground from height, we recommend you get the rubber bumpers from Nine Ball to protect your magazine butt plate from cracking apart. This magazine comes in shiny gloss silver finishing and it will match your 5.1 Match Custom perfectly.