FITS CHINESE MODELS WHICH HAVE A 3mm THREAD, WE HAVE A 4-48 THREAD VERSION FOR THE USA MODELS LISTED

WE HAVE THE 2 SCREWS LISTED WITHOUT THE WRENCH FOR A LOWER PRICE

 These upgrade breech screws fit the Chinese-made Crosman 1377, 1322 and 2240 models. They were designed by Magnum Airpower and custom-manufactured exclusively for us, they are not available from any other source. They have a T8 Torx-socket and are a direct-fit replacement for the original inner breech screw on all the models they are listed for. They are 3/16" long which is 1/16" shorter than the factory screw, it was made shorter so it doesn't stick as far down into the tube as the original which we felt was much longer than it needed to be. For the USA models Crosman used a longer screw that they got from an industrial supplier to avoid the expense of having a custom-length screw manufactured, that's why it's longer than it needed to be, it's what was cheap and readily available at the time. The Chinese models copied the length of the USA models.

 These custom screws are made of 410 stainless-steel heat treated to meet metric class 12.9 with a specified hardness of HRc 39-43. The approximate tensile strength is 185,000 PSI. In other words they are extremely strong.

 Do not over-tighten the screw, snug it down while squeezing the breech tight against the tube with your hand or a soft-jawed or padded vice. The screw should not be used to force the breech down, the combination of squeezing the breech and tube together while snugging the screw firmly is the best method to get the breech down tight while avoiding damage to the threads in the tube. 6-7 Inch lbs. or finger-tight only, no more torque than that is needed. If you use our T8 L-key and hold it by the shorter end inserting the longer end into the screw socket, it's a lot harder to apply enough force to strip the threads.