The biggest advantage of Holographic Sight over red dot is that prevents parallax distortion.
That is if your eyes are not properly aligned with sights in a red dot sight you will not hit what you are aiming with your sight, as you will not be looking parallel to the barrel of the weapon. This problem increases with the range of the target.
Holographic Sights, however, uses laser to produce a holographic reticle, which is not very prone to parallax errors.
However, there must be something which keeps Red dot in demand.
For magnified scopes and plain old red dot sights, there are usually two dials you adjust - one for up and down, one for left and right.
My ACOG replica and BSA red dot sights require a small flat head to be able to adjust said dials. Most sights follow the same thing, aside from holo sights which have buttons that don't require tools.
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Depends on what you mean by a "Scope". If you mean a red dot or low mag tactical scope, some do have those.
If you are talking about a magnified optic above 3x or 4x, then it makes little sense because there is so much vibration that you wouldn't be able to see anything. Second, a machine gun is not a precision fire weapon. It uses mass-produced ammo that doesn't have very tight tolerances for powder load or bullet weight. It is an area fire weapon primarily for suppression.
Buy new cups. Your ones are worn out and are remembering their position as retracted. One thing you can try is dropping them in a mug of boiling water for 5 minutes. Take them out and let them dry extended.
You simply need to choose if you prefer a better image quality or a smaller and lighter spotting scope. A spotting scope with a larger lens (60mm to 100mm) will have better light-gathering capability than a smaller 50mm lens spotting scope. This means that the image you see will be brighter and clearer. You will also enjoy a wider field of view. On the other hand the bigger the lens is, the larger and heavier your spotting scope will be. Larger spotting scopes are also more expensive.
Think about where you will be using the spotting scope the most. If you normally stay at a fixed location for a long period or don't need to worry about extra weight then opt for an 80mm to 100mm scope (if you can afford it of course). If you like to travel light or move around more than a 50mm to 60mm scope will suit you better. Some 50mm scopes can even be used without a tripod when needed.