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REX 10-40×50 scope

by B.B. Pelletier

The largest scope in Pyramyd’s lineup is this beautiful new Rex 10-40×50. Shown here with the sidewheel attachment mounted.

Springtime is when the shooting sports industry puts out the bulk of its new products, and this year Pyramyd AIR has an embarrassment of them! They told me there are so many new products that they can’t fit them all into their new product emails, so I am taking up some of the slack by showing you some of what’s new.

Rex scopes
Pyramyd AIR has added the Rex line of scopes to its scope line. These optics come from the same people who bring you the BAM air rifles; and from first examination, they appear to be just as well made. Today, I’ll take a look at the 10-40×50.

BIG glass!
This is a HUGE scope! It has a 30mm tube and a 50mm objective lens for which there is a sunshade, if you need it. At 33.5 oz. and 16.75″ long (without the sunshade!), this will be the largest scope many of you have ever seen! It is truely the Rolex Submariner of riflescopes.

BIG features!
The features are so plentiful I’ll just highlight them:

  • 30mm scope tube
  • Red illuminated reticle with 11 settings
  • Mil-dot/duplex reticle with center lines etched on glass for resistance to flaring
  • Eyepiece has adjustable diopter
  • Separate sunshade
  • Sidewheel parallax adjustment to less than 20 yards
  • Separate, large (3.7″) sidewheel for calibration of focus ranges
  • Target turrets with 1/8 MOA adjustments
  • Turrets are resettable for zero preservation
  • Spare battery included
  • Flip-up transparent lens caps
  • Waterproof & nitrogen-filled
  • Includes matching Weaver mounts

Now, so all of that makes sense to you, here are a couple pictures.

Lots of stuff in that box! Besides the scope, there’s a sunshade, a large sidewheel attachment, a spare battery, matching scope rings and the owner’s manual.

This closeup of the turret knobs shows the sidewheel parallax knob without the large wheel. Actually, the knob is pretty large by itself and will be fine for everyone who doesn’t want to know distances to the exact yard.

It takes a long time to properly evaluate a scope, but I’ve had this one long enough to give you some preliminary observations. It is very clear – even at the highest magnification, which is where scopes tend to fall off. The parallax adjustment goes below 20 yards; and if you set the magnification to 10x, the image will be very sharp and clear at just 10 yards. Pyramyd AIR has to tell you what the actual specifications are, and the parallax setting goes down to somewhere below 20 yards, but I’m telling you the scope is useful at 10 yards. I wouldn’t select it for field target, but I would get it for just about every other long-range or precision target airgun application I had.

Long-range airgun shooters and firearms shooters, alike, will find this scope to be the right ticket. As long as the light is good, I would put this big Rex up against any other scope. The 1/8 MOA adjustments mean you can control the strike of the round very precisely. It seems perfect for a large, accurate PCP.

26 thoughts on “REX 10-40×50 scope”

  1. Hey, quick question.

    I remember on your review of the leapers 8-32×56 scope you said it would make a great field target scope.

    What exactly makes it so this one, with higher magnification, isn’t as good.

    Don’t get me wrong, my 8-32 is my favorite scope. Crystal clear down to ten yards. I’m just curious. I thought the only thing that determined if it was FT capable was the magnification.



  2. It is usually possible to refocus sidewheel scopes for FT distances. I have done this for BSA and Tasco Custom Shop scopes (and virtually all sidewheel scopes available are clones of one of these two except the major names like Leupold, Nightforce, etc.). To refocus, unscrew the locking ring at the front of the scope (usually, this is relatively easy to do by hand). Once loose, unscrew the objective lens a bit (probably about a turn) and check for close focus. When you can focus to 10 yards — you don’t want much less or you may lose 55 yards — tighten the locking ring and calibrate the sidewheel.

    Another option is the Leupold 50′ adapter lens — it can be adapted to any scope with either camera adapters or (my solution) slipping it into the sun shade with some electrical tape for sizing. You will need two distance scales on the sidewheel if you do this — with and without the lens.

  3. Joe,

    Thanks for your tip. That’s how we did it back in the 1990s, when airgun scopes were not as full-featured as they are today.

    You know, scope makers make these huge sidewheels and don’t even now what we are using them for!


  4. Well if the new leapers scope islike the bug buster than its definately a great scope, for only $60 or $70 its an incredibly good scope, Ive had one for a few months now I bought off pyramid air, its hard to get adjusted to the gun because it has alot of features, but one it gets adjusted right, I was VERY impressed with it, been helping me to pick off squirrels at long distance or bugs on flowers from 3 yards with my break barrel rifles.


  5. To measure ctc, shoot at any range. Just measure the group from one edge of the farthest pellets apart to another pellet, the farthest apart from the first one. After you have that, subtract the diameter of a pellet you are using and you have a ctc measurement.

    It can be done at any range, it’s just a measurement of how wide a group is.

  6. i’m interested to see how these scopes stack up to the leapers. theyve been touted on the canadian airgun forum for a while now, although they dont have the leapers warranty beside it.
    i do notice, though, it looks cheap.
    yes, i mean the aesthetics. the lens caps look flimsy and the side wheel looks thin and fragile.

  7. hi bb
    the new airsoft name Echo 1 seems to be popping up everywhere. do you know if pyramyd will be stocking these aegs any time soon? there supposed to be very good at a resonable price.

    Field Targtier

  8. Same scope has been sold also at one point as Tasco Custom 10-40X50 Sidewheel IR with a “Christmas Tree” reticle. I know because I have one on top of my 22Lr rifle at the moment.

  9. i have a opossum in my yard at the moment and he’s causing some problems. I have a gamo 440 and a benji in .22. Are these guns powerful enough for a opossum at about 3-10 yards? What shot placement do you recomend? head shot with th .177 and a lung shot for the .22. my brother and i will try to put him down quick, so we will both shoot at the same time.

    PS good post on a scope that will soon be siting on my rifle


  10. Hey bg I would go for both of you going for head shots but from different angles first with the .177 then you’ll have afew seconds where their will be a pause then thats the window you need to take for the follow up with your .22 . Hey everyone new and old its nice to see that everything is still rolling along see you around guys Robert 1250

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