This is the new canted style of pressure gun that's used on the Mytee/Redline Spinner tools. For install instructions see the Usage & Tips tab.
When replacing an old or existing style gun prior to install the 4 mounting holes will need to be drilled out with a 1/8" drill bit. When drilling be sure to tape or place in a vice so when you take the screws apart the insides don't shift.
When replacing an old style, linear, gun with the newer canted gun it's recommended that the upper tube assembly (MP-H616-EA), and the new style bracket (MP-H641A-EA) be purchased as well.