25K seems a bit steep for what the gun is. I would scout out your other options and see what else is available, perhaps posting a buying thread with several options may yield some fruit.
BP-20 FEN, Weak Claw, Mod BC-30, LR-40 FEN, Thorifoid Mace FEN Edition, and possibly even some of the FEN MindForce chips if you're willing to flex a little on your price range.
On the flip side, I specialize almost exclusively in top level equipment and I've not had adequate incentive to do significant digging on the lower level weapons market recently. Consequently I am not intimately familiar with the weapons market in that range. The last weapon I sold in that ballpark was an LR-40 FEN Edition for about 25K PED and that was some time ago.
It has happened a lot to the 80+ efficiency market this past year. The broad mass of players finally catching up and realising the benefits (it's late, sure, but there was a huge delay in people realising the impact of Focused Blow in loot 1.0 too, for comparison), many old players coming back this covid year, or a combination of both is my guess as to why. When I came back in June/July I bought tier 2 Weak Argo Claw + amp for 13k. Mid-December I sold for 22k. I would assume the LR-40 Captain Jack sold for 25k one year ago made a similar jump (one seems to have gone for ~40k mid-December
here).
Latest sales I know of, three first ones confirmed:
BP20 FEN tier 2: ~18k - early December
Weak Argo Claw tier 2 + amp: 22k - mid December
Mod BC30 tier 3: 25k - late December
Mod BC30 tier 2: 23-24k? - early January. Tsunade's sale so he could fill in the blanks here or if he actually upgraded this one to the tier 3 he has for sale now for 25k instead.
Simply seems like this is what it takes to get on the 80% efficiency train nowadays. It's all a matter of if you hunt enough to save more than their possible price devaluation over a few years. That they do save you a significant relative amount of peds compared to 60% efficiency is quite clear however, both as stated by Mindark in their explanation of the 7% impact, but also in my own experience:
I tested the waters with (L) ArMatrix (60-65% efficiency) in June/July after coming back from a two year break, ~15k kills, 95.06% TT return. Bit low sample size, but I wasn't going to risk any more (especially spending a fair amount of markup as well) so switched to 80+% efficiency:
July-January, 80+% efficiency, ~150k kills, 99.01% TT return. If you remove ubers of 1k+, the number is 98%. Defense included (my defense costs are at around 1% of turnover).
The number for my Armatrix (L) log can probably be taken with a grain of salt due to low sample size of 15k kills (others can fill in here with their (L) experience), but 150k kills should at least be considered a decent number. Of course I did raise my looter skills during this time as well, by around 15 levels. So there's that.