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[1] first look at the guide rail, through your guide to determine whether you are suitable for wide gauge or narrow gauge fixture

Usually rail is divided into two kinds, one is the leather rail (weaver), rail width 20mm, this rail in the fixture called: wide rail fixture

There is also a dovetail (narrow foot), the width of the guide rail is 11mm, and the clamp used is: narrow gauge clamp; It is usually used on the I-shaped rifling tube steam dog, crossbow tool and pcp (such as vulture).

[2] Secondly, the annular part of the clamp is divided into 25.4mm, 30mm and 35mm. The diameter of the sight except the thinner part between the eyepiece and the objective lens is called the pipe diameter of the sight. To determine the pipe diameter of the sight, how many millimeters is the pipe diameter, and then select the fixture corresponding to the pipe diameter

[3] Wide-gauge clamps and narrow-gauge clamps are divided into four types: high-width/narrow clamps and short-width/narrow clamps.

The height of the fixture is, first, to pay attention to whether the short fixture can be properly installed on the gun. For example, when the diameter of the objective lens of the sight is too large and the short fixture is used, the objective lens barrel is blocked by the barrel and cannot be installed. The second is to look at the comfort and beauty of the gun.

[4] Fixture is also divided into split fixture and integral fixture. Split fixture is common.

The integral clamp means that the two clamp rings are fixed on a whole, and the distance between the two mirror rings is fixed. This clamp looks cool, but because the distance between the two mirror rings cannot be adjusted, the flexibility is not as good as the split clamp; if you need to pay attention to whether the width between the two mirror rings is suitable for installing your sight when selecting the overall fixture (for example, the distance between the two mirror rings of some overall fixtures is too wide to be used on the short sight, of course, there are also overall fixtures suitable for the short sight)