If you mean on the liner, mine only had two. My Wildcat 600mm barrel had three. I think the 700mm barrel might have four.
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There should only be two on the outside of the brass transfer port. A third one is inside the TP, to seal the pellet probe. A fourth is inside the stainless barrel housing. That's the one that can be shot out of you fire the gun with the liner removed.
Don't take this as gospel, as all rifles are different, as is each owner's use and expectations. My Crown is also .22, and I'm very pleased with the way it is shooting. On a good day, it shoots close to my RAW and Steyr, and that's no small feat. I'll offer two observations, based on my experience with the Crown and a few others. First, I think your reg is set high. Mine is on 135. I haven't really kept up with shot count, but it's good. I also think you might find your best accuracy at a slightly lower velocity, which would also enhance shot count. I have consistently found best accuracy with the JSB 16 around 880. My experience with the 18 is limited. I've shot it only on the High setting which, I think is around 940 in my rifle. Accuracy is acceptable, not as good as the 16 at 880. But, it's good enough for squirrel hunting, and higher velocity with a heavier pellet is not a bad thing for hunting. Lower velocities will also help with barrel fouling. These are soft lead pellets, and if pushed hard, they will really lead up some barrels quickly. Shooting lubed pellets may help, both in barrel maintenance and accuracy, but it's very barrel specific. I haven't found much difference.
Try the UTG snap-in dovetail-to-picatinny adapters. They are cheap but they might work for you. Those are the BKL adapters that I use with the 4K Pro on my Streamline, but I have it mounted with regular medium height scope rings...still a tad high but not bad. Worse is they aren't offset to the rear so my scope is quite a bit forward, which I make do with.
Also, if you don't need that kind of velocity, it might be best for you to lower the reg pressure. What velocity do you want to shoot? The reg pressure and hammer spring tension need to be adjusted to suit each other. Do you know how to tune?
What I do is choose a target velocity, say 930fps. Then I set the reg pressure to something low, like 130bar. With hammer spring pre-tension maxed out, I start with the hammer wheel on 1 and shoot a couple of shots. Shoot a couple more on 2, then 3 and so on up to Max. What I'm looking for is the velocity to level out as I work my way up on the hammer wheel. If it levels out but I'm short of my target velocity, then I increase reg pressure by 5 bar and start over shooting a couple of shots at each hammer wheel setting starting with 1.
I do this until I find the reg pressure that gives me my target velocity at it's chosen hammer wheel setting. From there I will shoot a full mag shot string to check for a tight Extreme Spread. Basically what you're looking for is the lowest reg pressure that will get you the velocity you want from your preferred pellet.
While you're tuning, keep in mind that you can use the "letter" side of the hammer wheel to fine-tune. The letters are basically half-steps on the number side. For instance, If you go from 5 to 4 and you get a big drop in velocity, try the hammer wheel on A and see if that gives you less of a drop. The hammer wheel settings go like this if you want to use the full range of the wheel: MAX - 5 - A - 4 - B - 3 - C - 2 - D - 1 - E - MIN.
I am currently at 140bar on my Crown 22 with 500mm barrel, Transfer Port on 25-30caliber, shooting JSB 18gr pellets at 928fps with ES of 12 and SD of 2. I've gotten ES as low as 7 and 5 a couple of times with SD of 1. The factory regulators in the new Crowns are very good.
Let us know if you need any more guidance.
The spread is really high too, that caught me by surprise when I saw that. Not sure how long it takes for the regulator to settle down, but will be keeping an eye on everything for sure.
It's too loud with the tube all the way in, better extended. I think with a lower pressure, it won't be as loud. I shot from inside my house through an open window or door. I never go outside so I can be seen, my neighbors probably wouldn't like it. My house sits on a 3rd of an acre with plenty of trees to shield my two KZ's from view too.
So far it's shooting okay groups at 20 yards, but could be better. Lowering the pressure may tighten up the groups but I need to get more pellets through the barrel before I mess with it.
Cheers, PB