The Brain Exploder redesigns the Silverback Airsoft DesertTech SRS Hop-up. Watch how he did the design... "Taking you through my thought and design process in creating a new hopup unit for the Silverback SRS Sniper Rifle. I think the hopup system it comes with is a good design but it requires a ton of work and time to adjust and is less than ideal for r-hopped barrels.
My design solves the problem by making it a simple less or more design and adds new features to create a more stable barrel install designed to eliminate clockwise rotation and several double check features that make it easy to center everything when installing. The 3 included nub designs help create a better contact between the bucking/patch and the BB as it leaves the barrel."