DX, here's the details on the 1500s I've tested:
CPS 1500 (I need to get the # off it when I get home): Pump cap screws off, not sure about nozzle cover: 46 ft 5x, 44 ft 10x
CPS 1500 same as above: 46 ft 5x, 44 ft 10x
CPS 1700 (didn't write down #): Pump cap screws off, nozzle cover is not glued: 45 ft on both nozzles (10x seemed fuller and output was slightly greater than the above 1500s). This is the gun I made Tribulation out of.
CPS 1500 Pump cap screws off, nozzle cover is glued: 45 ft both nozzles
I may have tested my cousin Andy's 1700 and my neighbor's 1700 but I would have to check my computer when I get home, cuz that's all the stats I have in my notes online. The crazy thing about the stats above is that... as you all know, 1 of the CPS 1500s was at the bottom of the lake for almost a year - fully pressurized. It horrifies me just to think about it, but the gun still shot the same distance! Absolutely insane. The stream isn't as laminated as it used to be, but it still shoots 44-46 feet. Absolutely impressive, and this is why I am a 1500/1700 man and not a 2500 man.
There are 2 noteable differences between the 2000 marks: PC size, and length of decorative piece underneath the clear "PC gauge." In terms of power, testing has shown that
on average the mk1 shoots further than the mk2, but also that this is not the case with all CPS 2000s. DX has tested 5? mk2s that shot anywhere from 47 to 53 feet, compared to an mk1 that shot 51-52 feet. In testing, individual guns didn't always shoot the same range, but individual variation was usually within 1 ft and never more than 2 feet. His averages (50 feet for mk1) and 52 feet for mk2 were exactly what I found in the CPS 2000s I have tested. The mk2 being Armageddon, originally owned by Commander Dave, and then the mk1 being my current CPS 2000. iSoaker's tests fall within this bell curve.
In my experience, the guns with the most variation, in performance, by "mark " are the 2100, 1200, and 600. For instance, I have tested 6 SC 600s (4 were NIB) and every mk1 shot 33 feet and every mk2 shot 37. There are many guns where I have tested various "marks" and the results were so close that I am skeptical of even calling the differences a "mark." See
CPS 1000. Typically we have defined a mark as physical variant in a particular model which has a corresponding deviation in performance. iSoaker's term, "variation" or "variant" seems like it would be much more appropriate to guns like the CPS 1500 where you have some guns with pump caps that unscrew, and others that don't; or XP 70s where the original features pipes that are placed together using O-rings, and later releases where the pipes are actually glued together - yet in both cases there is very little performance variation. On top of all this, some guns seem to vary in performance much more than others, and yet, we can't seem to identify any patterns that correspond to the variation. For example, we have 3 different releases of XP 150s, each with physical traits which make said release unique. However, in all my testing of XP 150s I have not found any correlation between mark and performance. I've tested 150s that shot anywhere from 30 to 37 feet. My mk3 (ugh why'd it break) shot 37 feet... but I only tested 1 mk3... what's not to say that it's just a statistical outlier? And since we can't seem to link the variation in performance to the 3 releases of the XP 150, should we even call the 3 releases "marks?" Things like this are probably better explained by individual wear and tear on the weapon.
Wow, that was a lot. *deep breath*
The best thing we can do is to test and then talk about it. I encourage everyone to test their guns and then post their findings in SEAL's testing topic. I have a statistical database on Hydrowar, which is going to be expanded greatly during the off season. I have over 20 more guns to add to the various databases, and I'm contemplating putting up shot curves and graphs that the public can look at. I was inspired by SSW's power drop off graphs for CPS, XP, and Max D blasters.
I am always open to people providing their stats and experiences with blasters. I would love to add everyone's test to my database and my reviews. The reviews and updated database will inform the reader how many guns of said particular model were tested, the variation, average, etc. as well as if anyone other than me provided data. The requirement, of course, being that you provide me with the method you used to measure said range (I'm also open to shot time). Providing a video would be even better (you can be private about it and not show your face). You can also provide a submitted review to iSoaker.com or if you feel doing a lot of work you could make a table on the wiki - but I suggest just having a links page instead that links to the testing topic and my statistical database. Also, DX is in the works regarding something on this subject, but I won't spoil the surprise... just wait til New Years.