The lower section clamps to CF bottle with two M3 screws providing substantial resistance to movement.
***Not designed for 700CC or 300CC bottle*** Material Carbon Filled (CF) PETG CF PETG selected for low shrinkage, resistance to heat, and high dimensional accuracy. The Black Arts Design Barrel Band, AKA Barrel Support Stabilizer, reduces the likelihood of POI shifts from bumps to the barrel and ends barrel droop induced by moderators. These bushings allow for a very snug fit but still allow a no hassle installation. The lower section clamps securely with two alloy steel screws and nuts.