We can actually make era balanced!!

Expensive guns may not have attachments or weak attachments.

Cheaper guns can have attachments which will allow you to compete better against the expensive guns. Cheap gun attachments can have a stronger effect but must be more expensive than the gun itself.

This way, you can buy an inexpensive gun. This won't be good against stronger expensive guns since you didn't pay lots of money. Make your gun better by buying attachments so that you can finally get to use your favourite gun again and do at least just as well as those people with expensive guns.