[btopless330]

You could try the MFI fake can:

http://www.mfiap.com/smallarms/ps-90.htm

I used this and a stock extention. I just have the sleeve about two inches forward. It will slightly mar the the barrel over time. I had to tighten the screws up real tight. They are plastic lined, but it will wear out over time. My friend is running a gemtech and a critical dimensions extention.

 

[btopless330]

I originally was going to use some sort of pvc pipe btw the fake can and the receiver. But I decided to just leave it alone. If you don't tighten up the set screws enuf, the sleeve moves back after a few rounds. It's best to check the sleeve to make sure it has not shifted back. Carry the allen wrench with you whenever you shoot.