This shell has the split functionality but does not have the integrated Hop-Up unit. That being said, the shell is best for users who want the split functionality and also want to use any Hop-Up chamber that they please.
Retro ARMS is a Czech company that uses its own manufacturing facilities to produce high-grade Gearbox parts.
These Gearbox Shells are fully CNC machined from a block of 7075 T6 Grade Aluminum. The 7075 T6 Aluminum is very strong and can endure a ton of stress.
This shell is 100% aligned and has several features (besides its material) that make it stand out.
-Large grooves for 2.5 mm silicone wires
-An Accurate hole to match the Anti-Reversal Latch so the latch does not fall
-An accurate hole for the trigger -- won't jump even with strong springs.
-Perfectly aligned 8mm bushing holes for optimal gear meshing.
-The guide grooves for the piston are in one piece -- no jamming of the piston on the rear window.
-The groove under the trigger contacts avoids possible short circuits when using MOSFET switches.
-Micro-sized grooves on the pins that hold the trigger and spring shuttle feeder hangers. Avoids popping springs.
Comes with a non-bearing Retro QSC Spring guide.