I am wanting to put a NV scope on a crossbow for beaver eradication close to a neighbor's house. Crossbow effective range will allow for adequate use of Gen 1 NV in my opinion. I now the differences in the gens and am looking to get some better gear down the road but I have 2 acres underwater and I think Gen 1 should fill this role well. Can I get some recommendations for a Gen 1 NV scope?