2 parts - printed spring piece locks into mag base. push mag to lock in, without rattle, until needed where it can be released with button press. Fits perfectly for Wells brand m4 mag, but will need a 1.5% depth sized up to fit JinMing (most popular budget brand). Features:

• push mag down to lock design
• Button quick mag release
• Water release hole
• belt attachment holes

~ 2h57m 61.8g (77.7 includig supports)