Looks like the they didnt follow the jig correct, call Aaen up and see if they will fix this for you, I went through this also on my Aaen, and also went through this on my DCS pipes, the jig has to be set up perfect or nothing will fit correct, found this out the hard way.
One of the main things I noticed when designing a pipe is for some reason the silencer always has some kind of fit issues, I worked with 4 different frames and every one fitted a bit different with the same pipe/silencer so I made the slip over for the stinger about 1.250" longer for adjustment, since I use the silicone hose to clamp the 2 ends together and makes it easier to adjust the fit.
 

Building and using a pipe jig is far from rocket science.  There is no excuse for a pipe not fitting unless your pipe jig mounting points consists of strings that are swinging and hanging from the ceiling or you are not using skilled pipe fabricators.  Maybe the pipes should be advertised as a pipe kit and some assembly/modification required up on delivery. 

Send the pipe back and make them fix the problem.  As long as people continue to fix the problem at thier own expense, manufactures will continue to crank out inferior products.