- MODIFY-TECH Flat Hop-Up Bucking - Soft Type - for 0.2g BBs SKU : MDF-GB-05-64 Smooth-bore chamber design omits contact point Long, flat tensioner nub to achieves sufficient hop up by using longer, but lower height contact section Suitable for most Marui-compatible AEG hop chamber - MODIFY-TECH Baton Ryusoku Hopup Bucking SKU : MDF-GB-05-63 Smooth-bore chamber design omits contact point Long, flat tensioner nub to achieves sufficient hop up by using longer, but lower height contact section Suitable for most Marui-compatible AEG Hop Chamber