Custom Crosman 2240 Review


By Todd Cooper



In factory form the Crosman 2240 is a low priced plinking pistol with a velocity of slightly better than 400 fps with 14.3 grain pellets. Accuracy is often quite reasonable with the 7.25" factory barrel but a little work on the crown usually helps in this area.


The 2240 is sometimes referred to as a "diamond in the rough" because there are so many modifications available for this little pistol. Modifications include metal breeches, custom bolt handles, bulk fillable adapters, hanging tank assemblies, longer barrels, valve performance tweaks, and the list goes on.


I had the opportunity to do an extensive test on a friendís modified Crosman 2240. The pistol turned out to be a decent performer with acceptable velocity and accuracy.


The mods on this particular 2240 include the following:


  CJTune Rino Breech

  Extended bolt probe

  12" Crosman barrel (2289 barrel cut down, crowned and lapped)

  Trigger tuned to 2-3 pounds

  Valve work (porting, lighter spring, etc)

  2289 hammer spring

  Aluminum muzzle brake

  Nickel plating

  Nikko Sterling 2X pistol scope


The custom contoured valve stem on this pistol was recently replaced because of a lifted seal. The new stem was an unaltered factory replacement. The breech-to-valve seal was also replaced several times as I tried to maximize velocity with a tight fit. Several seal sizes and shapes were tested without getting a perfect fit in the end.


Breech-to-Valve Seal

This little seal gave me much grief over the duration of my testing. The original CJTune seal was accidentally crushed and replaced with something else before I received the gun for testing. The seal that was in the pistol was an inadequate replacement which was leaking badly. Permission was received for experimenting to proceed.


First, I tried a stack of 2 nitrile o-rings under the breech and had to shim this stack with a small washer to get a tight fit. This system produced velocities of only 460 fps with 14.3gr pellets. Leakage was obviously a problem with this system.


Next, I tried a short piece of oxygen tank tubing from a drugstore. This tubing measures approximately .225" OD. The clear tubing has an internal support structure that creates a slight restriction of air flow through the tubing. This structure helps prevent accidental crushing of the tube when it is used on oxygen tanks and masks. The velocity using this tubing was approximately 500 fps with 14.3gr pellets. Things were looking better but I felt more velocity was available.


Finally, I tried fish tank bubbler hose. This hose measured about the same as the oxygen tube except there was no internal support structure to restrict flow. With a tight fitting "bubbler hose tube" I was able to achieve average velocities of 534 fps for 14.3gr pellets. This velocity lasted for a few powerlets but for the next shooting session velocities dropped back to 500 fps. The seal position either shifted or the plastic shrank. Once again a new seal was made and this time I achieved a 530 fps average with the same test pellet. All was well for another testing day. The next day the velocity was back to 500 fps.


I disassembled the 2240 enough times to loose interest in changing this seal again. I'm sure I would eventually get the correct length and things would stabilize at 530-535 fps but velocity readings were consistent at 500 fps so I did the accuracy testing at this velocity.


After all my testing was completed I obtained the correct seal length for the Rino breech from CJTune. The proper length should be .170"-.180". If I was thinking properly I would have asked for this information before I experimented with various tube lengths. Oh well.






On two occasions I was able to check velocity with a tight breech-to-valve seal. This data I believe is the true potential of this particular pistol. With a bit of patience a new seal should maintain the velocities I recorded.


Velocities with tight seal



Feet per second


Crosman WC


535, 533, 536, 536, 536, 535, 532, 537, 532, 532


Beeman Kodiak


453, 452, 452, 448, 447



Velocities with poor seal



Feet per second


Beeman FTS


501, 500, 501, 501, 499, 501, 501, 499, 497, 498


Beeman Trophy


506, 509, 502, 504, 502, 501, 504, 504, 502, 499


RWS Superdome


503, 505, 502, 500, 504, 503, 503, 500, 501, 498


RWS Hobby


542, 539, 542, 539, 539, 540, 541, 540, 539, 537










The top velocity figures give a true idea of this pistolís potential. The lower figures are helpful to see the velocity consistency among a 10 shot series. All shots were spaced about 30-40 seconds apart during the test. Less time between shots produced higher velocity fluctuations.


The temperature for all the testing was fairly stable at 68-69F degrees.






The custom 2240 was a bit of a gas pig so I was only able to complete 4 groups of 5 shots each with a full powerlet. A fresh powerlet was installed for each group series.


Throughout the accuracy testing the pistol was clamped in my Black and Decker Workmate to help minimize shooter error and give a fair evaluation of the gunís true potential.


5 shot groups @10 metres


Center-to-center (inch)


Crosman WC

.39, .26, .43, .38


Crosman CP

.43, .38, .20, .35


Beeman FTS

.25, .39, .18, .44


Beeman Trophy

.46, .43, .41, .53


Beeman Kodiak

.30" (Ran out of these pellets)

RWS Superdome

.45, .47, .21, .40


RWS Hobby

.40, .53, .37, .61


JSB Exact

.22, .44, .34, .44


JSB Exact

.33, .31, .40, .25


JSB Exact

.46, .37, .36, .35


JSB Exact

.22, .44, .42, .37



Accuracy with the Custom 2240 was quite acceptable. All 41 groups listed above were averaged out to .37"ctc. This is far from Olympic grade results but for a fun plinking gun it is more than adequate.


Shot Count

This custom 2240 was designed to achieve high power performance by modifying the factory valve to allow more CO2 to flow with every shot. This modification increases velocity but also allows less shots per CO2 powerlet. This particular pistol was giving 22-24 consistent shots per powerlet at 68-69F degrees.


Pistol Measurements

From the back of the pistol to the front of the muzzle brake measures 16". The 2X Nikko Sterling scope extends rearwards bringing the total length to 18" from the beginning of the scope's eyepiece to the end of the muzzle brake. The weight of the custom 2240 is 2lbs.12oz with the scope mounted.


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Copyright 2004