Thanks. I did wonder about what was obviously a coating on the Prometheus springs and how it would stand up to repeated use. The paint, or whatever it was, on the ASG springs seemed pretty durable but I gave up using them as they were ridiculously long.
It doesn't matter to me as much now as I keep a record of which spring each RIF contains.
You will notice the difference!
You don't need a posh etu; a Perun AB++ provides precocking and only requires rewiring although, assuming it is a V2 gearbox, if you are going to open up the gearbox to do that, you may as well fit an etu.
One of the advantages of a plastic toothed piston is that it can "settle in" when the AoE is not quite correct; this results in it looking a "little stripped".
Another advantage is that only the piston dies if PME or one of a few other nasty things happens.
Yes it does and yes it is.
There are other ways of achieving faster trigger response, such as fitting an FCU that includes trigger sensitivity adjustment.
True; if he did, I would buy them.
Ideally, they would need to be entirely coloured, like the Prometheus ones, or coloured at both ends so that you do not lose the indication if you have to trim them.
ASG and Prometheus do them.
I find it very easy to keep track of them; it just takes a bit of organisation.
I would rather use a single 0.3mm than three 0.1mm; it makes it easier to try to work out where that odd one you always find after opening a gearbox came from.
It works. I have done it on a couple of builds.
I run a 125mm inner barrel M4 with an M105 spring, getting 1.02J.
Sorting out airseals is cheap; better O rings, maybe a better fitting cylinder head and an O ring nozzle. Good airseals also help deliver more consistent power.
I find the etched shims that you sell perfectly adequate. Having the size on each shim is very helpful. Given that I am very old and wear glasses that would not look out of place on a Japanese sniper, you young chaps should not be struggling to read the etching.
SHS shims; they are good.
Before you start bunging a heavier spring in, have you checked that the airseals (piston head, cylinder head, air tube to nozzle, nozzle to rubber) are all good?
If they are, a somewhat stronger spring would be a good idea.
A full cylinder will lead to over voluming; in theory, a 1/2 cylinder would be the best match.
If you are in the UK, do not try to achieve 350fps (I assume you mean when using a 0.20g BB); given the variability of site chronos, there is a decent chance your new toy will end up going back in its bag.
Running between 0.97-1.05J on your preferred BB weight with a good hop unit (ZCI?) and a Maple Leaf Macaron with an AK2M4 red nub will give you all the range you need.
Which one are you getting?
Ant Supplies sell a couple of rails that fit the weird L85 rail.
https://www.ant-supplies.uk/rails-and-adapters/sa80-l85-picatinny-stanag-rail-adapter.html
https://www.ant-supplies.uk/rails-and-adapters/airsoft-sa80-adapter-rail.html