G&P WOC Fighting Cat Fixed Stock GBB Rifle Tactical Each gun is available with

Each gun is available with a QD design on both sides of the butt stock to allow the user to use the QD mount on either the left or right side of the gun

After a period of testing

with high flow internals

you can change the power spring quickly  Real steel factory standard high strength duralumin forged frame

Reason being that with the long contact patch nub

G&P WOC Fighting Cat Fixed Stock GBB Rifle Tactical Each gun is available withNEW RELEASE! G&P Full Metal Custom M4 Series based on WA M4 Gas Blow Back Rifle WA internal parts with all possible METAL upgrade from G&P such as Hop up chamber set Crispy Metal Sounds & Smoother slide cycling 4 Sides 3. 5inch Free Floating Unit Thanks G&P Industry offers this Compact Size M4 Gas Blow Back Rifle Upgrade Include: WA Fighting Cat Metal Body (WP01) WA Fighting Cat Front Set (WP77) WA M4A1 Spare Magazine (50rds) Flash QD Flip Up Sight