GBL AK Iron Man Metal Hop Unit
※DIY ability required !
※Correct installation method: Remove the barrel first , and then installing the HOP-UP set. Final install the barrel back.※
● Material: Metal made
● Shooting range: above 70M (test with 0.36bb)
● Compatible with GBB inner barrel, user needs to modify a little bit if using AEG barrel.
(The original GHK inner tube is AEG specification)
● [Click here] to see the tutorial of installation.