CP Barrel! Wont work!? HELP!

[Prairie]

So, I recieved my CP Barrel today, and I cant get it to work with my standard feed body.

The barrel has a T design on the threads, but when I put it in I cant get it to turn for my hopper right standard fed mag, PLEASE, someone help!

[Miscue]

? Make sure the barrel's ball hole is on top when you put it in. Slide in and twist. Oil the rings a bit.

[Prairie]

I did release the barrel guider a bit in my body rail, it worked like a charm