In game, it has 2 rounds in the magazine. The companion app and third party apps show it should have 4 rounds. Honestly, that’s what it should have if it’s occupying the heavy/exotic slot.

Well I completed the seals a long time ago. I deleted the weapon and re-acquired it from collections. Would I have to re-acquire it on the character I completed the quest on?

Ok I was super confused because it’s hard for me to remember how Acrius was when we first got it. I swore the initial version had one round in the mag and the upgraded version had 2. Then I’m pretty sure you guys upgraded it’s ammo inventory at some point. I seriously felt like it had 4 in the mag at one point though. So if this doesn’t work, would I just make a new post on the help forum?

First, if you can pull it from your collection you completed the quest, or completed it enough that it considered the gun finished. Second, I can confirm that DIM and light.gg both say the Acrius has 4 rounds in the mag. It should list 2, unless you have the catalyst which has 6. I have a PS4 account and PC account. Both accounts have the LoA, but my PS4 account only has the first version of the Acrius. Basically it's the last thing I did before I switched to PC permanently. DIM on my PS4 character lists 4 (should be 1 for me, but 2 for fully unlocked). DIM on my PC lists 6, because I got the catalyst as well as completing it. Looks like an API bug to me.