Last night I notice a strange issue with the SCAR ammo. Every time I died, my ammo carry capacity got lower! I was using the SCAR with the extended drum. I had 80 in the drum and 120 spare rounds. I got killed in the section where you first meet the stalker aliens. After I reloaded from the last checkpoint (which was right before I died), I only had 80 spare rounds and I couldn't pick up any more. A little later, I got killed in the fight in the train station. After loading to the previous checkpoint, I could only carry 40 spare rounds!

I switched to the Feline and then the Grendel after the SCAR started acting up, and I haven't had the issue again, but I didn't play too much past that point. Has anyone else noticed that they suddenly can't carry as much ammo? I thought I saw a similar post the other day, but I didn't find it in the first several pages of the PC forum.

This reminds me of the bug in Crysis 1, WH, and 2, where rocket launcher ammo would often disappear from my inventory and from the game world on a reload.

Update: It seems I now have a permanent deficit of SCAR ammo. Sometimes if I pick up a SCAR, it will say I have -80 (that's negative) spare rounds, sometimes It'll show the infinity symbol. In any case, I usually can't have more than what's currently in the magazine. If I walk over another SCAR, it will say OUT OF AMMO, then CANNOT CARRY MORE. It can get back to normal if I carry both a SCAR and a SCARAB, but they're sharing the ammo, and I revert back to 40 or zero spare rounds if I drop one of them.

This svcks. The SCAR works fine if I go back to an early save (in the first chapter), but my current save is screwed ever since I equipped the extended ammo attachment at some point in the second chapter.

I have the same Problem with the SCAR.
I can only carry 40 rounds with normal magazine and 80 with extended magazine. In my HUD it says i got -80 rounds left. Every other gun works fine.

I have also replicated this problem or at least a variation of it, I was carrying an extended magazine SCAR which I switched with a ranged scar, shortly after that I was limited to the 40 rounds which were already loaded into the gun. I could not carry any extra ammo. This sounds like a fairly minor problem but it really bothers me! I've used the scar in each and every game so I begrudge having to use lesser weapons in its place.

Has there been any acknowledgement of this bug by Crytek or any word as to when it will be patched? Alternatively, does anyone know a sure fire way of getting a normal magazine size back?

I did a lot of experimenting last night with switching weapons, changing magazine type, carrying two SCAR-ammo weapons, reloading the game, playing earlier saves before the ammo count got corrupted, etc. I couldn't find any way to get my current save working properly again.

At this point, I think my choices are to either go back to a save before the SCAR got messed up (and never use the extended magazine), or finish the game without using SCARs (except for occasionally picking one up and using its measly 40 rounds if I run out of ammo for another weapon).

... does anyone know a sure fire way of getting a normal magazine size back?

I finally managed to get my game working properly again by choosing Replay Mission for the most recent mission in the Campaign menu. I had to redo part of the game that I had cleared (the dam level), but not as much as if I went back to a save before things went wonky.

I kept all my suit upgrades and unused upgrade points, but I lost some weapon attachment unlocks--specifically, the silencer for the SCAR. Not too big a deal, I've got the bow for silent killing, and at least I can use the SCAR again. I'm going to avoid using the extended magazine, because I think the SCAR got screwed up shortly after I equipped that for the first time.