NOT KNOWN DETAILS ABOUT HK416D GEL BLASTER WITH SMR HANDGUARD

both equally v3 and v4 of the LDT HK416 are great, however The only shot in HK416 v4 will likely be extra stable because of the mosfet mounted. Both versions provided by AKgelblaster comes with metal gears. it provides semi-automatic and totally automatic firing modes, allowing people to choose the most suitable mode for their gel blasting needs.