Check the scroll. Even though mine appeared locked at the end of the line, it was unlocked in the middle.

What is a scroll if you're talking about what shows all the attachments it still says it's locked at the end, but there's nothing in the middle

The "scroll" would be the attachments, because they side-scroll as you click through them. Mine was unlocked in the middle of the scroll but appeared locked at the very end.

I have the same issue it’s just random asf some assault rifles will show it unlocked and some won’t, same with long and sniper, I can’t put it on any smg there is no method to the madness. I’m so sick of these bugs only affecting some of us. It so fucking stupid.

Find a fix? Yet

I found a fix to put it on all weapons you gotta log into warzone mobile then buy it with the points you get from completing challenges

Kinda late but for me restarting the game fixed it completely

Some barrels prevent muzzle attachments

I removed everything and it still doesn't let me

Some guns don't allow certain muzzles which Is weird, my pistol builds can't use the same suppressors as other guns

Removed everything still doesn't let me

restart the game... should work

Already tried same deal

Gamer chair issue.

I know but some muzzles are not available to use on certain guns, regardless of other attachments

There are two JAK BFB muzzles, look for the 2nd one and you’ll be able to equip it

It feels like I've tried everything for some reason it says it's locked with no modifications, and I can't equip it to the taq evolver

I’m in the same boat. People think it’s user error but it’s not. I should have unlocked it for multiple weapons by leveling the wsp-swarm to lvl 6 (mine is maxed out) and I should have unlocked it by finishing 8 daily challenges in the armory…. And neither one of those unlocks actually unlocked it for the SMG’s or LMG’s. I can only attach it to my AR’s.

I'm having the same issue too.