M4 AEG Inside Gear Box Tech Work

-This does not cover gun shipping costs too and from the store.

If you want to buy an M4 and have us upgrade it to you THEN ship it to your or you pick it up in store or at an event, buy the M4 and all the upgrade parts plus add this to your cart.

Covers just about anything that takes no more than 2 hours such as installation/inspection/repair of....

-Trigger contacts

-Piston 

-Trigger

-Cylinder items

-Spring 

-HPA engine installation which also includes free trigger tuning.