My two cents worth… delay chips aren’t anything I’ve ever bothered with… more an airsoft thing and nothing I’ve ever found essential on a gel blaster. 
@RokSolid I know you have an opinion on them. 
Yes @Friendly_Fire my opinion is the same. Ditch the delayer, it is more an airsoft thing that generally doesn’t apply to gel. Usually the extra travel of the tappet plate means you want it to return faster not slower!
Got rid of the sector delay chip and put some red loctite on the sector gear hex screws. I was able to get gold of an OG SRC nozzle so that’s sorted.
I’ve started doing a dry fit and noticed these marks on the inside of the cylinder, it’s deep enough that you can feel the groove that’s been created. Is that a concern or for the cost of a new cylinder and piston is it worth replacing while I’ve got it apart?
Also what’s the best method for cleaning the gunk off everything in the gearbox prior to refreshing the grease and oil, I figure stay away from anything petroleum based?
Always worth thread locking those sector gear screws!
For cleaning I use isopropyl alcohol, paper towel and cotton tips.
If you have everything apart you can use hasher cleaners on metal parts but alcohol is my preferred solution to many of life’s problems! 
As for the cylinder, I am guessing that is the rear end of it… and would either be the piston rack rubbing on it, or the piston head… to me looks like the rack.
Usually you see this when the piston is a bit loose in the gearbox runners, and or… the piston rack is too wide. I only use thin rack pistons by choice for this reason.
It would be worth replacing the cylinder as that will not do great things to the o-ring.
I would also look at trying to find a piston that sits in the runners a bit more neatly with less vertical movement. Ideally none but then it won’t move freely so you need a little jiggle, but less is better.
I am not familiar with the piston in SRC, but changing may also need a piston head. My only advice is flat and round ones are best.
You’d think it’d be common V2, but as I haven’t played with one wtf do I know.
They just like to change shit on you because they think it’s funny. 
There is mods you can do like the APS to get it better suited for gell ball away from american hard ball
Takes trial and error.
Have you got Vernier Calipers @Jug what is the length of that cylinder. Lets go back to basics. I dunno if I was there I could probably see what’s going on, but seeing as I am not and likely a few hundred dollars of Greta Toonburgers diesel away this will have to do.
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I do indeed have verniers
@RokSolid by flat or round piston heads does that mean the face of the piston head is either completely flat, or convex in a rounded shape, like a dome?
Completely flat piston heads are the best imo.
No deformation of cylinder head pads, and a nice air brake effect to save a little risk of breaking the gearbox, not that I have heard of src boxes breaking.
Like this. Is my favourite piston head style.
Did you open those holes up or are do they come like that? Seem generously sized 
Drilling them out bigger is a modification I usually carry out, particularly with nylon cylinder heads… they’re usually tiny.
More air through those holes, better o ring expansion, better compression, less vacuum on the return stroke. 
I’ve also gotten in the habit of using thinner section green o rings for that reason.
That’s a JG piston head… I wish I could buy them without getting a whole gearbox or blaster.
Good size holes. I also bore out the holes in the nylon heads with the tiny holes. Helps a lot.
mm as I was thinking that is V2 airsoft where as Gelball cylinders to get the volume for the bigger balllz are 72mm.
But lets not get in to that as it’s can get in to rocket fuel JP8 territory Why we run Diesel
And yes you need to open them holes up so it does the air flow thang @Friendly_Fire always my first bit of 9" action
I had a good UK(as we have free trade agreement) 2 day delivery on perfect silicone O rings for the main piston at a quarter of the price they were charging in AUS for green sshit whatever.
I made the mistake of posting about it to help everyone, they got smashed and been out of stock for a few years now
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Ah… here we go! 
The 9" grinder… the Swiss Army knife of powertools
Nice wide o-ring groove as well. 
Many piston heads run very tight grooves, restricting the o-ring from being able to roll back on the backstroke and causing all sorts of vacuuming issues. 
Thanks gents I’ll visit a few shops so I can see first hand what Im looking at
Command Elite Hobbies, Armoured Heaven, XForce and Tactical Edge are close enough to me
Yes they are very good. Nice big holes so they don’t suck… literally
Took the OG cylinder to Xforce Saturday however the ones they had were a different size.
I ended up buying one online from Tactical edge which is an SRC brand cylinder, thinking that it would fit in my SRC blaster. Unless I’m doing something wrong it’s ever so slightly too long.
Is there a course of action from here or should I return the cylinder to try and find the correct length unit?
Edit: Cant seem to pictures to upload at the moment, will try again tomorrow
Hmm someone else will have to confirm but AS is 70mm length usually ish and gel ball is 72mm length. Yea might be .1mm in the lengths for the fuss pots that like to cringe.
Surely they should have known that if that is what it is from your description. All I can think of.
And the length of the above cylinder is 72mm I bet.
You can trim it down on a lathe if you have access, file it down with a file and deburring the end.
Or go back to the store with your original, photos via email the differences of the two with your verniers.
I think this is the one you need SRC SR4 Series 100% Cylinder - Durable AEG Blaster Upgrade – Tactical Edge Hobbies
I think it’s out of stock likely why they gave you another brand.
Myself I’d go the file method, doesn’t have to be super accurate, just smooth so it doesn’t tear up the O ring on assembly. It’s only 1.5mm difference. File a bit, check fitment, might only need a mm until it fits.
I have the right one sitting here you can have but be couple weeks before I get to post office. Maybe someone closer has one kicking around.
