Well, I have several scope options from a collection I already have on hand....... (until I can scrape up the $$ for an EOTec, Trijicon, or such....and since we are having a new roof put on this week, that might be a while)...... but, none fit just right. The one that fit with tall rings, still wasn't tall enough for proper eye-to-scope alignment.....and the ones with larger objective lenses bottomed out on the hand-guard.
So..... I ordered these UTG medium and high picatinny risers through Amazon. The full length riser was $14 and the two small ones were $8 each. They are solidly made and look to be sturdy.
Now maybe I can do some real shootin' with the thing.