This is a very good barrel, I have a Core Delta with a LAPCO 12" Auto Spirit and Ive shot all types of paint thru this barrel and all seem to be very accurate and quiet. The barrel is light as heck and looks cool on my gun. Ive hit the bottom of soda cans from 65 feet away with this barrel.
Nothing to me.......just that you have to buy a new barrel plug because of the Muzzle Brake on the end or you could just wrap a peice of duct tape around your plug.
The barrel I used is 12" and I use it on my Core Delta Pro wich is a Spyder clone and it shoots Marbalizers, VL, and Brass Eagle paint good. I paid $20 for my barrel cuz it was used and the kid couldnt find anyone to sell it to and he thought it was ugly (because he has a blue shutter and it doesnt match). This barrel is much better than any 32degreez, Armson, Taso, and ACI barrels. I would recomend this barrel to anyone whos uses the following guns........ Spyders, Mags, Cockers, or M98s because Ive used those guns with LAPCO Auto Spirits on them and they all shoot great.