In this category, it is listed whether the mount is attached to the optical device with rings or via rail. In the red dot sight adapters section, it is written which red dot sight the adapter is made for.
If the mount is attached to the optical device with rings, the ring diameter is listed:
25.4 mm/1 inch (in most cases interchangeable with 26 mm)
30 mm
34 mm
35 mm
36 mm
40 mm
If the mount is attached to the optical device with rail, the rail type is listed:
LM rail
Zeiss ZM/VM rail
Swarovski SR rail
S&B Convex rail
Picatinny rail
Pulsar Apex, Trail, Digisight
Dedal NV
Fortuna General
In the red dot sight adapters section, it is written which red dot sight the adapter is for:
Docter sight mounts
Aimpoint Micro mounts
Zeiss compact
Trijicon MRO
Shield sights
C-more
...
Zeiss Compact Point
BH height
BH stands for Bauhöhe (ger.) which means overall height. It is measured from the mounting surface of the rifle to the lower surface of the riflescope's tube.
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Extension (KR)
KR stands for Kröpfung (ger.) which means extension. This is the distance between the mounting surface and the front ring, measured horizontally. If the ring is exactly above the mounting surface, the KR is 0 mm.
KR 0.0 mm
Inclination
Inclination
Often, the elevation adjustment that the riflescope offers is not adequate to compensate for the bullet drop when shooting at long range. When the riflescope runs of out of elevation, a mount with an inclination is needed. 20 MOA is the most common inclination. With it, the user gains 58.2 cm / 100 m of additional elevation range when shooting at the range of 100 m. This is approx. 5.8 Mrad of elevation.
