NOW WITH FULL METAL RAILED SHS PISTON
So you want to spoil your M4A1 GEN 8 and give it some grunt and at the same time keep it tight and tough! We can help with the "HULK" upgrade pack. Say goodbye to what you've been used to and move onto a whole new level.
Pair this "HULK" pack with the M4A1 "Special" upgrade pack (1.2 spring, alloy barrel, tpice, hopup) and you're on a winner.
1. Upgraded 460 motor BLUE/SILVER (just drop her right in no mods needed)
2. Metal gear set
3. New piston (SUPER QUITE) with metal grab teeth
4. New enhanced o'ring to top it all off
YOU ARE BUYING:
# M4A1 GEN8 JinMing Full Metal Gears, 460 Upgraded motor and Upgraded Plunger Set code name "HULK"
*These mods i would classify as easy to medium difficulty