Im just going to add my recent experience here and hope I get a resolution. (I may add that my luck with Airsoft kit so far can only be discribed as "completely shit")
Started looking at upgrades to my Cyma 702 week before last. Found some of the descriptions on Airsoft Pro's site really confusing, M24, VSR, Snow Wolf etc seems to be fairly indistinct so pinged a message to Radek "Tech Guru" who suggested a couple of parts I might want to think about.
Put an oder in for north of £200. Pinged a note of this at Radek for a final nod. Shipping notice arrived. Got a note that I might want to consider a tighter barrel. Asked to amend my order. Nothing back
Parcel arrived (£27 of shipping well spent) Opened the package and toyed with the parts. Cylinder head doesnt fit the cylinder supplied. Mailed Radek, who was very aplogetic, told to return for refund. Wonder how much return of £15 part will be? Then last night I started assembly in earnest only to find that the Trigger Unit and Piston dont fit the 702. Labelled as "for VSR and copies".
Have, mailed and rung today but clearly they arent in. £120 of my £244 order doesnt fit. Thats not very confidence inspiring!
Will update when I receive word back.
Update Radek Emailed me. Recognises he didnt see this in my mail. Suggested replacements and asked me to return with them covering postage.
Cannot really say fairer than that!
You can only really tell a good company when something goes wrong.