Problem with removing barrel from receiver

[Joel Gustafson]

First of all I'm really impressed with this website. Very helpful and informative, and I know very little about Parkers.
I recently purchased my first Parker SxS 10 ga, N, 3, Twist, serial # 61068 at an estate sale. I'm pretty excited to add this to my collection. All my current guns are modern firearms. Everything appears to be original. The barrel, receiver, and trigger guard all have same serial # of 61068.

First question: would this be a Trojan? I don't really know how to tell.

Second question and my big problem: How do I remove the barrel from the receiver? I know, stupid question, but I just can't get the barrel from the receiver. I own many o/u and sxs shotguns and have never had this problem. The gun breaks open and locks up just fine. I've removed the forearm, and when I try to remove the barrel it just won't come off the receiver. I've even tried it with the safety both on and off thinking that might be it, but still no luck.

Any help would be greatly appreciated.