Thanks for the heads up on the FX No-Limit Rings.
I've had the Avengex for a little better than a week. I wanted to shoot the gun a little so we could get used to each other. The only changes I've done to the rifle is to adjust the regulator and hammer spring adjustment. They are the key to tuning the rifle. I've only shot the 14.5gr RWS Superdome in it so far and I'm pretty sure the rifle doesn't like them. Groups are terrible. The best 10 shot group is 1.558" at 30 yards. The worst is double that. The RWS pellets have worked fine in my Theoben break barrel but the Avengex is a different animal. The front part of the pellet has a diameter of .217 which seems to be standard groove for air rifle 22 barrels. My old batch of pellets have a skirt dimension of .2225" and the newer is .2254". That seems to be a bunch of swageing in the chamber to me. Throat in the barrel seems to be pretty abrupt like most of the pistol barrels we see today. The barrel air transport hole has a pretty jagged saw tooth pattern on one edge from burrs being pushed up when drill punched the hole and the burrs were busted out. Didn't appear that any time was taken to clean the bore after the manufacturing processes. I spent 5.5 hours cleaning and smoothing the bore. The crown still showed burrs on the edges of the lands where the band saw had cut it to length. Patches left fuzz with every pass until I got the JB bore compound to do it's thing. The barrel is real easy to remove and clamp to the bench. Barrel and shroud come off as one piece. Teslong showed every thing that was going on in there.
Now for the good part. The rest of the rifle is a gem. I found everything easy to operate and worked like it should. When I stopped shooting to reload the mag, the reg pressure would creep 150 psi but that didn't mean the shot didn't go to group. After the first shot reg pressure stayed right on for the rest of the string. Did matter if the cylinder was at 4k or 2K. Trigger was the same shot after shot. The rifle has little to no recoil. Once set on the bag you only need to steer the rifle with your thumb and do your trigger work.
I've got some JSB Jumbo Heavy 18 grain pellets coming which I hope will make my group woes go away. It may sound like I don't like the rifle. I like it a bunch and look forward to shooting it. Extreme spreads are never more than 20 fps and standard deviations are single digit. So far.