Virtue/Tadao Board:
Worth having if you can spare the cash...allows accurate adjustment of all functions of teh gun. As said, also has several firing modes of which all are adjustable. For tournament use, yes..these modes have to be locked off and for teh most part capped...but...if you play walk on, or recball etc..where the rate opf fire etc isnt capped or illegal, they are massive fun..massive.
They also seem to have faster trigger monitoring, and both boards have micro switch triggers, which many people prefer over teh Optical trigger on teh stock board.
15 Degree FRM:
Looks teh mutt's nut's! Gives a comfortable hand hold, helps with running and gunning as was stated...doesnt have a guage mount, which may be a good or bad thing depending on your viewpoint.
Star Reg:
Not sure if it is better than teh stock reg, but...it is a nicer shape, and as badly described, has a lower section which swivels, so you can choose which side, (if any) your macro line passes to your ASA, for if you are right or left handed.
Star Trigger:
I personally dont really liek any of teh current triggers for ego's, tho teh star is better. I am waiting for something nice from CP or NDZ...witha bump.
Though, with ramping...it doenst really matter as if you cant walk 7 bps with any trigger on an Electro gat, there is something wrong.
Stock/Dart/Nexus Bolt:
Stock bolt is crap...DART is better, but still breaks paint...Nexus is teh mutts nutts, and is teh best bolt available for teh ego, including aftermarket companies like NDZ...Get one.
OOPS:
As was said, this "On Off Purge System", allows you to de-gas your gun completey before unscrewing teh tank, which helps save O-Rings.
It is usually found with a rail assembly.
If you have a Star frame, they have a rail built in to teh bottom.
I personally, dont think there is sufficient room for adjustment with this set up, as teh oops wont allow me to shorten my setup any further.
Still very good though.
CCU:
CCU is actually, "CCU Kit" Colour Contrast Upgrade Kit.
As said, it allows you to have a contrasting (see what they did there?) colour on teh bolt on parts of your Ego...LPR cap, Trigger, Eye covers, Feedneck etc.
And can easily be changed to suit your mood.
All in all...these bits all cost money...most are nice to have and if included in teh price of a secondhand gun, are worth while.
That said, a stock ego...wont be noticeably different to shoot than an Upped one, but the upped one may be more confortable to use and look nicer.
Other upgrades to look out for are:
Lucky Air Assist Valve:
...Reduces teh amount of force required to open teh valve, hence lower LPR pressure, lower kick, improved efficiency, less likely to breakl paint as it hits it more softly.
Hybrid Grips:
...After market grips in various colours and designs...have a bird with her legs open on your gat..it's all good!
Barrel Kit:
...There are many varied kits out there, some good..some less so.
My choice at teh moment is a Redz Pepper Stick kit. Other barrels are Empire, Evil Pipe and dare I say teh Freak System (new one looks better).
Barrels with changeable backs are Planet Shaft, Dye Ultralights etc.
Ram Caps:
...The stock Ego Ram cap (small round bit at back of gun), is made of aluminium and if misstreated, can round off, leaving you a bit buggered when you need to get your rammer out.
A stainless version from Slothball is availabel and is a worthwhile addition.
Adjustable ram caps, liek I have by Hybrid are also available BUT...YOU DO NOT NEED TO ADJUST, NOR SHOULD YOU, your ram.
I only have teh adjustable one, as I like how it looks and it can be removed without tools. Until such time as someone makes an aftermarket ram, with varied tolerances, or if your ego magically turns itself into a peice of **** like a Timmy, you do not need to adjust your ram cap.
Erm...some people like stickers...I prefer to get my guns reannodised, coz it looks way better and in my case, means you have a one off gun.