Did you have a thought in mind re what the acronym might stand for? I see on acronym finder many listings for MRP, but none stand out too much for me.
As has been noted, the publicly recorded sales for systems is really sparse. While pay(.)systems sold for $10,000 and eLearning(.)systems for $1136, that was back in 2015 and 2014 when there was more excitement (a bit) around the extension. The re-sales since them have been for tiny amounts ($35 for BinaryOptions, $39 once and then $11 for Asian, and $1 for WaterFiltration).
If you have a free listing option, e.g. through a marketplace where they are listed, I would try to list them for a tiny amount ($ to mid $$). I had luck in selling a 3 letter .science acronym that was not too well known that way, so at least got a multiple of my registration expense.
If there is some obvious acronym, I would try to contact those who might have interest in it. You might even try making up your own acronym - I actually suggested a new acronym in the text that went with the marketplace listing for the one I know (along with a number of existing ones). Like Mobile Revenue Payment or Most Respected People (two I just made up!). Good luck.
PS After I wrote the above I checked also on SoldDomains (beta) and noticed a new sale from end of November of 2017, $1500 for grid(.)systems, so now 3 sales over $1000, and 7 sales in total, not a lot but a little more encouraging.