My RB was a pain as well, and I tried all the tricks I've read here with no success. I ended-up buying a nylon tipped, dead-blow hammer (smallest, cheapest I could find) and ground the sides flat so it would fit inside the receiver with the bolt removed. I added a little penetrating oil to where the barrel enters the receiver and after waiting an hour, I put the barrel/receiver on a soft towel with the bottom of the receiver facing up. I positioned the hammer inside and gave the back of the receiver a few small taps and it started to move a tiny bit with each strike. Trial and error, but it worked great. After 3-4 gentle taps, it came off by hand as it should.
2 Pointers though;
1.Not allot of room to work inside that thing, cut your mallet short too if you have no room to move it.
2.gentle strikes! Hard to do any damage with that little room to move, but worth mentioning.
Once I got mine out, I got some 400 grit wet/dry and smoothed-off the receiver end of the barrel by hand. (gripped the end with paper in hand, twisted the barrel) Added a very thin coat of oil and installed it again. Nice and tight, still easy to remove if necessary.
BTW, in my case, the barrel was just rotated about 1-1/2 degrees counter-clockwise. (when aiming, looking down the barrel) The V-Block allows very little rotation of course, but just enough to correct this.
Good luck, let us know how you make out.
