Search online for power plenum install huma , for Artemis p15 and or Spa /Artemis p35 they share 95% of components, including the airtube and regulator, or disassembly of these guns... I have installed the same on 2 P15's regulator Regulator goes in airtube facing fill end so plenum is facing...
Qingliu Makes predominantly Airsoft Guns and Some Springers but could not find PCP's : http://fjairgun.com/index1.asp I would assume they manufacture and white label for Lancer (Airsoft) They are as far as I know not related to SPA (Snowpeak)
Uragan 25 - Huma Reg, Saber Tactical Picattiny Rail, Neoprene Bottle and Shroud Covers... Decided to stain and treat plain walnut stock, added texture, shadowing and multiple layers of Tru oil to get the desired effect...
+1 Midas TAC, However I have a Vector Taurus 6x24x 50 that gives it a run for the money and IMHO just looks better for my eyes...and I have heard good things about the Vector Optics Continental
The GX 40 is the urban with a longer barrel, If its hard to cock then the hammer spring is too tight, you need to back it out a few turns... With the slightly longer barrel you would be able to get a good 750 - 800 FPS at a slightly lower hammer spring setting than the Urban...