The bases are very thin and i had them on a BAR and you could see the sight very well. The BAR and the BLR lighting use the same bases so should work the same. Use the Maxima bases. I had a BLR in 358 Win but never had a scope on it and just purchased to use with iron sights.
The regular BLR use a different number base.
BLR Lighting uses base # M848 front and rear
Regular BLR uses base # M838 front and rear