Usually the little end of the spring doesn't have enough of a corner to really catch on the side of the barrel so it doesn't really retain the wedge with much force.
As was said, the "hook" on the end of the spring is really made to catch on the screw on the left side of the barrel when the wedge is slid out to that side.
Your wedge was pounded into the gun far too far by someone who didn't understand how these guns should be assembled.
This wedge, unlike many barrel retaining wedges on many rifles actually is a true wedge. The further it is driven in, the tighter it drives the barrel back towards the receiver (or frame).
I suggest that you spray the wedge and slot as well as you can with a good penetrating oil and give it some time to work.
Then, using something soft to protect the muzzle, tap the barrel fairly hard, back towards the receiver a few times.
Then, using a brass rod as a punch try again to drive the wedge out of the slot from the right side.
When you replace the wedge, drive it in gently until just the nose of it protrudes out the right side. Check to see if the barrel is tight against the frame at the bottom. If it is, then your almost done. If it is not, tap it in a bit further until the barrel and frame are making contact at the bottom.
When this is done, unscrew the little screw on the left side of the frame until it hits the wedge. Now, your done.
The next time you remove the wedge and replace it, the little screw will stop the wedge in the right place. :thumbsup: