After PDW and SCAR .You can open bolt with your WE GBB M4 now .
Use to replace the original parts in your M4
Suitable For WE M4 Series Open Bolt / Open Chamber Gas Blow Black GBB Rifle

Make it real and Shoot Faster
Have a greater blow back Effect :
1.More powerful Blow back recoil
2.Hide the part of your original Inner barrel

Highly recommend for M4 players who want a High simulation GBB
Notes: Upgrading GBB require necessary skill & technique to dissemble , consult expertise if needed.

Open bolt Set include:
1.Inner Barrel
2.Loading MUZZLE
3.Trigger Set
4.Barrel Housing
5.Gas Block
6.Magazine Airtight Rubber
7.Bolt Catch

Color : Black
Weight(Gram):632(With Box)