Home Blog  
CO2 RidgeRunner’s Crosman 150: Part One

RidgeRunner’s Crosman 150: Part One

Today reader RidgeRunner continues his a blog series on his experiences with the Crosman 150 air pistol. Today he starts to repair the 150 pistol I sent him. If you’d like to write a guest post for this blog, please email me at blogger@pyramydair.com.

Take it away, RidgeRunner

RidgeRunner’s Crosman 150 – Part One
by RidgeRunner

Quinn’s Crosman 150

Crosman 150
The Crosman 150 I will be sealing.

This report covers:

  • Thanks
  • On with the show
  • Chamber
  • Removing the valve assembly 
  • The reseal
  • Assembly
  • Summary


First thing I would like to do is thank BB for not only sending me this 150, but for being such a wonderful inspiration for so many of us and for his personal support for RRHFWA, which would not even exist if it were not for him.

Next, I would like to thank Derrick of  Another Airgun Blog for writing and photographing his experience with resealing his 150.  It was most certainly a big help to me.

I would also like to thank Dennis Baker and his gang for putting together so many seal kits, one of which I used on this air pistol.

about to start
I’m about to start.

On with the show

The very first thing I did was unscrew the front gas tube plug and remove the wonderful one-piece laminated wood grips by removing the two screws holding them to the frame and sliding them backwards.  Many of the Crosman 150s that I have seen have two plastic slab grips — one on each side, but this one has some real nice grips.  I may do something with them at a later date, but not right now.

The next thing I did was remove the screw holding on the rear sight.  It also held the rear of the barrel to the gas tube, retained the rear barrel plug and also held the hammer/striker in.

repair chamber
This 150 has a breech cover that slides back to pull the bolt back for loading a pellet.

Next I removed the small screw from the breech cover.  This allowed the cover to slide off of the rear of the barrel and also allowed the bolt to slide out of the back of the barrel.

For my next trick, I removed the screw holding the front sight to the barrel.  The front sight on this 150 is plastic, but the one on Quinn’s is metal.  I may have to look for one of those. [Editor’s note: The metal sight is original to the gun. The plastic sight is a replacement Crosman made in latter years.]

150 repair started
After starting this is what I had.

Now that the bolt is out of the way, I can access the screw that is still holding the barrel onto the gas tube.  With this screw removed, the barrel just falls off of the gas tube, revealing the transfer port and its gasket.

The next thing I do is remove the two screws holding the grip frame and trigger assembly to the gas tube.  They also just drop away now.  All this leaves is the valve assembly and the stop block still in the gas tube.  This is also where it got a little tricky.

150 repair almost there
Everything except the valve assembly and stop block are now out.

Removing the valve assembly 

I took a long, hard look at Derrick’s blog to determine just how he removed the valve assembly from this tube.  How did he get the valve stem out of the way to remove the stop block pin?  In his blog he took a long, thin pin and pushed on the valve stem with it and then knocked the stop block pin out.  Well, I took my small pin punch, but no matter how hard I pushed, the valve stem would not get out of my way.

What I did not realize is when Derrick pushed on the valve stem, his valve assembly slid forward.  This one did not.  I then took my rubber mallet and hammered on the punch until the valve assembly did slide forward enough to allow me to remove the stop block pin.  After that the stop block just slid right out of the back of the gas tube and allowing me to use a larger punch to push the valve assembly out of the front of the gas tube.

Once this was accomplished, it was a simple matter of unscrewing the back of the valve assembly to get it apart and start resealing.

150 repair valve assembly
The valve disassembled.

The reseal

In the kit I purchased from Dennis and the gang were two white o-rings, a small black o-ring, a large black o-ring, a soft black transfer port gasket, a new spring and a new valve stem.

The white o-rings go — one on the screw-on cap and the other on the front of the valve assembly.  The large black o-ring goes on the inside of the back of the valve assembly.  You can probably figure out where the valve stem and the spring go.  If these give you any trouble, you had better not be doing this.

The small black o-ring goes on the bolt and you can probably figure out where the transfer port gasket goes.

Shop Outdoor Gear


Now it’s time to put it all back together.  Really, it is not that bad.  The first thing you should do is clean the gas tube.  Mine was pretty cruddy.  That may be why the valve assembly did not just slide out.

After cleaning, I inserted the stop block and pin.  Next thing I did was push the valve assembly in place, making sure the threaded hole in it lined up with the screw hole for the grip assembly screw. From here on out reassembly is just the reverse of taking this apart.  Even I could do it.


This took a lot longer for you to read about than for me to do it.  Next time around I will shoot this thing across my chronograph and see how fast it is.

55 thoughts on “RidgeRunner’s Crosman 150: Part One”

  1. RidgeRunner,

    What very simple setup for a very simple little pistol. Is the transfer port gasket one piece or is there a metal component? I believe that is the part where most people usually use a 1/4 inch silicone tube if the original transfer port gasket was not available.


    • Siraniko,

      The transfer port is just the black rubber gasket. All it needs to do is seal the gap between the barrel and the body tube. I did not measure the outer diameter of the gasket, but a short piece of soft tube would do just fine for the transfer port. The transfer port gasket was just a little longer than the thickness of an o-ring that could possibly been used.

  2. Yes, it is a good Idea to place removed parts on a clean surface just as they would be in a diagram and in the proper orientation for assembly. It’s amazing how fast you can forget where things go, and which way they go back together when you get interrupted.
    If I remember correctly, I removed an air transfer port when I installed a steel breach on a Crosman and it looked like it fit right side up and upside down? Had to take apart another one to verify the correct installation.
    I simply did not pay attention when I removed it.

  3. Ridgerunner, once disassembled, what did you clean the parts with? Thanks and thanks for the blog. I have a Crosman 111 and 112 that need similar attention. Can’t wait for the next installment!

    • RG,

      I used a little Balistol and a good bit of rubbing with a cloth on the parts to clean them. You really need to get to those Crosmans. Keep the camera handy and write down you experiences with them. Inquiring minds want to know.

  4. Thanks for another well done report. There is a lot of satisfaction to be had in restoring vintage items. This particular one appears to be doable for most of us. But we might not know that without reports like this one. Looking forward to the next report on this gun.

    • These “old gals” are really simple to work on and also really well made. You almost have to try to mess these things up. I guess it is possible, but I am no rocket scientist. If I can do it, just about anyone can.

      By the way, BB already has the next report on this particular gun.

      • RidgeRunner,

        Well done BZ
        On Part 2 are you going to do a shooting report?
        What does the bore look like?


        PS: TETRA makes some products that you may want to look at. But Balistol is excellent if that’s what you got.

        PPS: please don’t refinish your RB Grips.

        • shootski,

          I will be doing some velocity testing in Part 2. I forgot to bring a screwdriver to adjust the sights when I took it to the range, so you will have to wait for a Part 3 to see how she groups.

          The bore looked nice. The body tube was kind of cruddy inside. Now that I know a little bit more about the grips, I doubt I will be refinishing them.

          • RidgeRunner,

            It was interesting to see all the complaints when Crosman went away from charging the tube and going straight into the valve body. The downside of that change made sense in that it was the better heat sink of filling the tube. Of course the CO2 in the tube causes lots of corrosion potentially.
            I would guess that more liberal use than even the Godfather Of Airguns® would recommend of Pellgunoil or similar would decrease the corrosion potential.


  5. Congratulations!
    Even back in the `80’s the 150 was a desirable pistol.
    My grand father kept one in his tackle box.
    It’s the pistol that got me started on my airgun journey. It would fit in my back pocket. And it has a gratifying report!
    I do prefer the 2nd version with the one piece barrel and breech, much easier to insert the pellet.

    • Breeze,

      I am not sure which version I have, but I sure do like it. I have to admit this is the first CO2 pistol I have enjoyed fooling with. I may have to find me some more of these “old gals” to rebuild and pop off a bit.

  6. Thanks RR, nice write up!

    Like the grip. Was thinking of making something like that to dress up my PP750 which has the standard flat slabs on it.

    Always like to peek inside. This makes me want to look at the Crosman 130 that is in (severe) need of some TLC.

    Happy Monday!

    • “…the Crosman 130 that is in (severe) need of some TLC.”

      I’ve had two of those so far, and I could see getting another one.
      They may not be super-powerful, but they can be pretty darn accurate little shooters! 🙂
      Good luck with it, & happy shooting,

  7. RoadRunner,

    “If these give you any trouble, you had better not be doing this.”

    RR, you just described me precisely! ;^) Just the same, I read this report eagerly.


      • RidgeRunner,

        Hmmm. Well . . . I have a Palmer Cap’Chur Red’s Special, which is essentially a Crosman 160 modded to .50. The action of the 160/180 is similar to that of the 150/157. So . . . My Red’s Special has two CO2 Powerlets lodged into the gas tube. It could probably also use a reseal.

        Maybe I will chance it.


        • Michael,

          Warm up the gas tube the Powerlets (assumption on my part is that they are empty) that are stuck inside of with a heatgun (hairdryer) they may come out with a tap. If not, gel super glue blob on the end of a metal rod to Powerlet let cure pull out. Long drill and tap/screw pull out.
          Disassembly may be necessary but it looks like you could get far enough to knock them out with a dowel.
          RidgeRunner or Tom can tell you if that will work better than me…i have only done something similar (Super Glue trick) on a guys 22XX.


          • shootski,

            Both CO2 powerlets might be full. I might try drops of Kroil and let it stand on its end for a couple days.

            I need to look at it from the end of the tube to remind myself of whether or not the powerlet facing muzzle-ward is pierced. If it is, then the inner one likely is, too. It has been in the dead airgun corner of my basement for six or seven years.


  8. I have at least 1 Crosman 150. It has left handed wooden grips on it. I am not sure if they were made by RB or someone else. At one time, I bought a rough Ted Williams version of the 150 that has the rail above the barrel. That particular 150 was probably the most accurate pistol I had that wasn’t a match gun or highly modified like my LD. Some people say the Ted Williams version has a better barrel, but others say it was the same barrel as the standard 150. All I know is that particular 150 was more accurate for me than any other I have shot.

    My problem with the 150 is how loud it is. It is too loud to shoot at my place.

    If you like the Crosman 150, Ron Robinson has written extensively about them in one or two of his books.

    David Enoch

    • DavidEnoch,

      The 150 does have a rather loud report. So does the 22xx but at least you have the room up front to put a silencer on it.

      At my place I could blast away with a .30-06 and would not likely raise eyebrows.

  9. RidgeRunner,
    Great job on the report!
    This pistol looks a lot easier to rebuild than the vintage Crosman 357
    (that I managed to dork up, and had to send it to Rick at Precision Pellet to “get it right” =>).
    Perhaps even I could do it. 😉
    Looking forward to seeing how she shoots,

  10. Motorman and everyone else.
    One more thing. An outstanding suggestion from Shootski a while back.
    Anytime you disassemble something with small springs, do it inside a clear plastic bag to avoid removing your shoes and moving your furniture around looking for it after it flies off in an unknown direction.

  11. Challange coins and such must have come out after I retired in 1987 at 40.
    Funny, patches reminded me of a Weekend Warrior who, through his special welding talent and civilian work with the government, managed to enlist in the Reserves, bypass any boot camp and start out as an E6.
    He had absolutely no idea how the Navy or aircraft functioned, rules and regulations. He came to weekend drills with civilian shoes and belt and had an aviator’s leather jacket totally covered with patches from various Squadrons and duty stations way back to Vietnam days. He was never at any of them, let alone on active duty. He must have had a very high-ranking friend. He was promoted to CPO first time up without time in grade?

    Best I could make out he must have been an undercover agent? Our aircraft did fly internationally.

Leave a Comment

Buy With Confidence

  • Free Shipping

    Get FREE shipping on qualifying orders! Any order $150+ with a shipping address in the contiguous US will receive the option for free ground shipping on items sold & shipped by Pyramyd AIR during checkout. Certain restrictions apply.

    Free shipping may not be combined with a coupon unless stated otherwise.

    View Shipping Info

  • Shipping Time Frame

    We work hard to get all orders placed by 12 pm EST out the door within 24 hours on weekdays because we know how excited you are to receive your order. Weekends and holiday shipping times will vary.

    During busy holidays, we step our efforts to ship all orders as fast as possible, but you may experience an additional 1-2 day delay before your order ships. This may also happen if you change your order during processing.

    View Shipping Times

  • Shipping Restrictions

    It's important to know that due to state and local laws, there are certain restrictions for various products. It's up to you to research and comply with the laws in your state, county, and city. If you live in a state or city where air guns are treated as firearms you may be able to take advantage of our FFL special program.

    U.S. federal law requires that all airsoft guns are sold with a 1/4-inch blaze orange muzzle or an orange flash hider to avoid the guns being mistaken for firearms.

    View Shipping Restrictions

  • Expert Service and Repair

    We have a team of expert technicians and a complete repair shop that are able to service a large variety of brands/models of airguns. Additionally, we are a factory-authorized repair/warranty station for popular brands such as Air Arms, Air Venturi, Crosman, Diana, Seneca, and Weihrauch airguns.

    Our experts also offer exclusive 10-for-$10 Test and 20-for-$20 Service, which evaluates your air gun prior to leaving our warehouse. You'll be able to add these services as you place your order.

    View Service Info

  • Warranty Info

    Shop and purchase with confidence knowing that all of our air guns (except airsoft) are protected by a minimum 1-year manufacturer's warranty from the date of purchase unless otherwise noted on the product page.

    A warranty is provided by each manufacturer to ensure that your product is free of defect in both materials and workmanship.

    View Warranty Details

  • Exchanges / Refunds

    Didn't get what you wanted or have a problem? We understand that sometimes things aren't right and our team is serious about resolving these issues quickly. We can often help you fix small to medium issues over the phone or email.

    If you need to return an item please read our return policy.

    Learn About Returns

Get FREE shipping on qualifying orders! Any order $150+ with a shipping address in the contiguous US will receive the option for free ground shipping on items sold & shipped by Pyramyd AIR during checkout. Certain restrictions apply.

Free shipping may not be combined with a coupon unless stated otherwise.

View Shipping Info

Text JOIN to 91256 and get $10 OFF Your Next $50+ Order!

* By providing your number above, you agree to receive recurring autodialed marketing text msgs (e.g. cart reminders) to the mobile number used at opt-in from Pyramyd AIR on 91256. Reply with birthday MM/DD/YYYY to verify legal age of 18+ in order to receive texts. Consent is not a condition of purchase. Msg frequency may vary. Msg & data rates may apply. Reply HELP for help and STOP to cancel. See Terms and Conditions & Privacy Policy.