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[1] First look at the guide rail, through your guide rail to determine whether you are suitable for wide gauge or narrow gauge fixture
Usually the guide rail is divided into two kinds, one is the leather rail (Weaver), guide rail width of 20mm, this guide rail is called on the fixture: wide gauge fixture.
There is also a dovetail (narrow foot), guide rail width is 11mm, the use of the jig: narrow gauge jig; It is usually used on I-rifling steedogs, crossbows, PCPs (such as vultures).
[2] Secondly, the ring part of the fixture is the clamping mirror barrel, which is divided into 25.4mm, 30mm and 35mm. The diameter of the thinner part in the middle of the eyepiece and objective lens is called the diameter of the sight. To determine how many millimeters the diameter of the sight is, then select the fixture corresponding to the diameter of the pipe
[3] wide gauge fixture and narrow gauge fixture have high and low points, roughly divided into: high width/narrow fixture, short width/narrow fixture 4 kinds
The height of the jig, one is to pay attention to the jig can be properly installed on the gun, such as the sight lens diameter is too large to use the high jig, the objective lens barrel to block the gun, not installed; Second, it depends on the comfort of the gun, as well as the aesthetic degree.
[4] fixture is also divided into split fixture and the overall fixture, split clamp common
The overall clamp is two clamp rings are fixed on a whole, the distance between the two mirror rings is fixed, this kind of clamp looks cool, but because the distance between the two mirror rings is not adjustable, the flexibility is not as good as the split clamp; If the overall fixture is selected, it is necessary to pay attention to whether the width between the two mirror rings is suitable for your sight (for example, the distance between the two mirror rings of the overall fixture is too wide to be used on the short-branch sight, of course, there are also the overall fixture suitable for the short-branch sight)