One is the Black Arts Design Barrel Band, AKA Barrel Support Stabilizer. White marks are are co-witness marks that can be wiped off.
The other one - I don't know but it's very, very solid and just as good or better.
$30 each or $55 shipped for both. PPFF
The other one - I don't know but it's very, very solid and just as good or better.
$30 each or $55 shipped for both. PPFF