I was torn on replacing the collet bushing because many ran just fine. I primarily decided to replace it just to keep the original as is. I've hard fit several from EGW and have had good results. I will probably never sell this one and will pass it on to one of the kids, but wanted all the original parts. The trigger in this gun will be hard to get use to, but it is a work of art none the less. I wonder how the new CNC guns compare to the older well fit guns.