Springer Precision for guide rod and springs. I went with the tungsten for the weight but they also have S/Steel.
Grab a selection of spring weights to allow for you to tune for best results. I am running a 12lb with 135gn HP TGRSRKs and ~4.0gn AP70N
These parts aren't covered under ATARS nor require a B709 Import permit.
Springer Precision's online store doesn't natively accommodate shipment to Australia but drop them an email and they are happy to process your order manually. Mine was via Paypal money request etc..
Have a look around the site while you are there as there is plenty of other goodies. Extended mag release, Magazine Base Pads, grip tape etc... Probably steer clear of the magazine extensions though.
That said, better check the rulebook for your intended comp as these mods may bump you into the "Anything Goes" class.
Some other bits that may be of interest:
Don't forget to swing by Armory Craft for your new dual adjustable trigger.
https://www.armorycraft.com/product-pag ... le-triggerAnd then see if you can source the GrayGuns competition trigger kit.
For completeness: GoGuns Gas Pedal. (A great conversation starter with the purists. haha)
Loving my X5.
p.s. I get to shoot Prod. Optics but aren't competitive enough for anyone to worry about the non-production nature of a few parts. I don't practice enough, nor take it too seriously such that I feel that I am cheating other competitors with such an "unfair advantage". lol. The club shoots are pretty casual and they are a mostly good bunch of folks. That makes a big difference.
Cheers