The newer model NV/day scopes like the pard and sytong are awesome with the ballistics and rangefinder.
However, if you aren't going with one of those models then the clip on units are very handy. You can hunt until dark with a normal scope then clip on your NV and away you go. I have shot a lot of animals with clip ons. Thousands.
Reason was prior to the newer units with ballistics etc you could reliably switch the the clip on very quickly between several rifles. And for a lot of what I was doing, with the clip on you have the ability to dial and shoot out to 600 yards plus at night.
I have never bothered with spacers for any unit, most I have done is put on a slip on recoil pad, which is not very often.
As far as illuminators go, 850 is not completely invisible but has far more range and clarity than the 940 which is invisible. An external IR is handy for extended ranges.
I have not used the sytong NV scope with ballistics so can't comment on the IR range but have had a go with the pard DS35 and you can shoot a long way at night without an external IR. The clarity is better than a clip on too.
Out of the 6 sytong NV and thermal units the guys currently have none have crapped out. 3 out of the 5 pards have had issues.
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