Yes
Im not sure that they could ad in parts but they can exchange parts for better quality performance.. & maybe they might be able to adjust the air release chamber for air increase. Awesomeness1.
Yea they do full upgrades. Pretty much anything they sell can be added.
Yes... they sell just about every thing you desire for you airsoft gun!!
Yes, they sell parts and fix or upgrade your guns.
Yes, they sell parts both internal and external upgrades and you can ask for them to install them for you.
Thanks! Your answer is awaiting moderation.