equally v3 and v4 with the LDT HK416 are perfect, however The only shot in HK416 v4 is going to be a lot more steady due to mosfet set up. equally versions made available from AKgelblaster comes with metal gears.
The https://marcdwpf642131.blog2freedom.com/28164610/the-best-side-of-hk416-gel-blaster-malaysia