This will Fit On Window your F.A.S.T hop unit real snug and pushes your bucking in a concave shape. Unlike many other nubs on the market this is special designed for the F.A.S.T hop unit of your Silverback SRS.

Panthera Hop Arm + Panthera Concave Nub (Set)

Panthera Concave Nub

These nubs will Fit On Window your F.A.S.T hop unit real snug and pushes your bucking in a concave shape. Unlike many other nubs on the market these nubs are special designed for the F.A.S.T hop unit of your Silverback SRS.

The Tigra Nub is designed for barrels with smaller windows.Because the nub has descending front and back it work marvelous with R-Hop setups but also works with normal bucking setups. The Tigra Nub is the smalles nub in the family and increases range and

SRS Prowler Rubber Nub 60°

SRS Prowler Rubber Nub 60°+75° (Set)

Panthera Hop Arm

SRS Prowler Rubber Nub 75°