by B.B. Pelletier

Part 1

Today, I’ll mount a scope on the Air Arms S410 sidelever and give you the particulars for that. But first, let me clear up some things since the initial post.

Why does the fill device look like that?
Bill Sanders of Air Arms contacted me and gave me the story about the fill device. A number of Air Arms PCPs that were sent to Japan were having trouble with the fill device due to rust and corrosion. Because they are in Japan, the company has to deal with the problem long-distance, so they decided to reengineer the fill device. They made the fill port on the rifle from stainless steel and the separate adapter from bronze. They also put a sintered bronze screen inside the fill port to keep dirt out of the gun.

Bill also told me Air Arms put ball bearings in the cocking linkage, which is why it is so easy to operate. Little touches like that do cost more, but once you try them, you usually forget the price.

Keeping track of the pellets
I mentioned in part one that there was no way to know when the gun was out of pellets, but reader Chase told me to examine the magazine closely and I’d see a dot. Wherever you position this dot (so it can be seen) when you insert the magazine, when it comes around to that place again, you are out of pellets. I also have developed a feel of the loading lever for when there is a pellet and when there isn’t, so the dot isn’t needed anymore. Thank goodness for that, because it’s hard for me to see.


The ammo reminder is a dot at 7 o’clock on the edge of the metal cylinder inside the plastic. It may be colored red, but I’m red-green colorblind and it looks black to me.

And which S410 sidelever rifle am I testing?
This one I thought I had covered, because all my links lead to the same beech-stocked rifle. So there’s no doubt, and so you can also see how it looks with the scope mounted, I’m showing it to you now.


I mounted a Swift 6-18x50mm scope, which is a good match for this rifle.

The scope must straddle that magazine
Everyone who looks at this rifle notices that the magazine stands proud of the receiver. This is typical for most repeaters that have a revolving cylinder. It means you need to use 2-piece mounts, and they have to be high enough to clear the bottom of the scope. As you can see in the picture, B-Square adjustable high rings work fine. Because the magazine goes in from the side, there are no issues of clearance above the mag housing.


The scope easily straddles the magazine. I could have used a medium-height mount and still had clearance.

How to adjust the adjustable scope mounts
You have to give each scope mount at least a half turn of elevation for the gimbal action to work (I guess we really need that scope primer, don’t we?). On PCPs that normally do not have barrel droop, I give the front ring a half turn and the rear a full turn. That gives the scope an ever-so-slight downward slant that is usually right on. I pretty much center the posts on the split-rings (these are adjustable scope mounts) which also centers the scope. If the barrel sticks out straight from the receiver and if the dovetails are machined parallel to the bore, the scope will be close to right on.

I’m using a powerful scope
Because the S410 can reach out there, I selected a Swift 6-18×50 scope. It’s clear enough for long-range shooting, yet this particular scope doesn’t weigh much. It has a 1″ tube, so it isn’t as bright as some of the newer 6-18x scopes with 30mm tubes; but on a bright range, it does all right.

In our next installment, we’ll go to the range.