Well MB01 L96 sniper which i purchased a few years ago which has been sitting in the gun bag unused for the past few years as I no longer play airsoft. The MB01 was spray painted black and almost completely upgraded internally- the following have been upgraded:

1)Full Metal trigger box with metal contacts 

2)Upgraded Spring, Upgraded metal Piston, Upgraded metal Ball Bearing Spring Guide (as part of upgrade package) to increase FPS to 500-550

3) Madbull 6.03mm Black python Ver.2 Tight Bore Barrel 

4)  Barrel Spacers for accuracy (3/4 installed)

5) Hop up unit, hop up bucking and hop up arm upgraded (can't remember the company but it'll be reputable)

6) Airsoft Pro cylinder (able to handle 500+ FPS comfortably)

7) Upgraded cylinder head with teflon seal

Also included is

1) 6-24x40 mm scope (over time the increased magnification has blurred so may be best to replace, lower magnification is crystal clear)

2) Bipod with Tri rail attachment 

All in all the gun originally cost £160 (without scope or attachments) + £400/500 of internal upgrades and over £100 of attachments so this is a bargain. After upgrades it was shooting 500-550 if i remember. 

3) Speed loader with L96 mag adaptor 

4) Full Metal L96 Magazine 

5) Camouflage gun bag  (this cost £80-90 originally and has various compartments for magazines, speed loaders etc ).