Rifle Scopes Sightron S33-R4 on AR Flattop

[KHOOKS]

Anyone running the Sightron S33-R4 on a flattop AR-15? If so, what riser are you running to get the sight above the front sight post. With the sight mounted without a riser I'm looking thur the front sight about a 1/2" below the top of the front post.

Thanks,
Ken