Artemis M16a is Dianna Stormrider

Hi guys just wondered if anyone has tinkered with one of these rifles which are one in the same just named different for the UK version and US. I am looking for any pointers or mods on tuning this rifle to get the best from it,
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so any tips or advice would be great thx.
 
I believe the M16A product under the Diana label is the "Outlaw". A buddy of mine has the stormrider, it is the smaller, tube-reservoir gun very similar to the Benjamin Discovery in size and price. My buddy's stormrider is getting a dozen shots at just at or under 30fpe from a 3000psi fill. But I suspect this isn't the information you're looking for.