Well your specs are hard to meet. The only ones I know of that have no blow back are the Triumph and the Endeavor and they have high comb stocks that are designed for scopes. The majority of inlines have an extensive amount of blow back even the better more expensive ones like the omega and the better Knights. The main reason I have a Triumph is because of no blow back, I just don't like blow back close to my eyes. Even my Omega has quite a bit, if it did not I would suggest it as it has a stock designed for iron sights. Lee