I used AIM c/as back in the day, only complaint was I had no turning radius to the poorly engineerd uppers. I know most of there stuff is inferior, but some shit is OK. Would I personally... NO not when theres better. However I have heard quite a few using the FBI arms and no problems. I ordered a set for a CK and never heard back from the customer, so I guess OK?
P.S. Frank @ Reds usses alot of there bags with no issues. So I ordered some to try, look nice?
My 2 pennies.