Red Dot Reflex Sight (cont'd again)?

alright guys i did take your advice on this one but unfortunatly the onees you did suggest failed me. So now i must re open my questions. note the words in bold print. i am in the market for a red dot sight that is LIGHTWEIGHT and WEATHERPROOF. Yet economic in price and VALUE. I express alot of emphasis on weight. I have an SKS( pretty damn accurate 1" at 100yrd i did practice that one) but my optic failed. What is a good reflex sight for this rifle? Keep in mind i wont be shooting more than 150 meters. please dont refer me to airsoft optics, or optics that are absolutely shitty. I do want an optic that can easily be mounted on and off.