The L-key is not automatically included, it must be selected separately if needed.

 These breech screws are custom manufactured for Magnum Airpower, they are not available anywhere else.

 This custom-made Torx-drive stainless steel screw is an exact-fit replacement for the original inner breech screw on all 1377, 1322, 2289, 2240, 2250, 2260, 2300, 2400KT, 1300KT, Discovery, Maximus and similar models. The Torx socket fits a T8 driver which is not included. The T8 L-key can be selected separately if needed.

 The 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.

 Do not over-tighten the screw, snug it down only until the breech is firmly against the tube with no wobble. It will strip the threads in the tube, the screw threads are much stronger. If an L-key is used, hold the short end with the long end inserted into the screw. In that position it's harder to over-tighten.

 INNER BREECH SCREW LOCATION: For Discovery, Maximus, 2300 and 2400 models it's underneath the bolt, if you pull the bolt all the way back you can barely see it under there. You have to remove the rear breech screw and rear trigger frame screw to take off the rear tube plug. Then remove the bolt handle. Now you can push the bolt back far enough to expose the inner breech screw. I suggest putting a very light coat of medium strength threadlocker on the bolt handle when you put it back on. They tend to come loose otherwise, you only need to put it on finger tight, don't use a wrench, easy to damage the threads. The standard Crosman Steel Breech Kit, 13XX and many other models have the screw in the position shown in the photo.