RETROARMS ULTRA CNC HOP UP UNIT M4 SERIES (RA-9430)

ULTRA HOP UP UNIT
IN CNC-MACHINED ALUMINUM
FOR M4/AR15 SERIES ELECTRIC RIFLES
WEIGHT 10g

THE ULTIMATE SOLUTION FOR PLAYERS WHO WANT A FULLY CUSTOMIZABLE HOP-UP CHAMBER.
THE ULTRA HOP-UP CHAMBER IS ALSO BASED ON OUR BASIC CHAMBER AND IS MADE ON PRECISION CNC MACHINES FROM AIRCRAFT-GRADE 7075 ALUMINUM. THIS CHAMBER ALSO HAS THE ADJUSTABLE FEED SHAFT LIKE THE PRO CHAMBER.
NEW FEATURES INCLUDE THE ADJUSTABLE NOZZLE SHAFT, WHICH IS DESIGNED TO MOVE THE CHAMBER FURTHER FORWARD WHEN NEEDED. THIS FEATURE IS REALLY USEFUL FOR ADJUSTING THE LONGITUDINAL POSITION OF THE CHAMBER AND THEREFORE, FOR EXAMPLE, ADJUSTING FEEDING RELIABILITY OR POSITION RELATIVE TO THE MAGAZINE. THE POSITION CAN BE ADJUSTED IN 0.2 MM INCREMENTS WITH THE INCLUDED SHIMS. KEEP IN MIND THAT THIS FEATURE ALSO REQUIRES THE USE OF NOZZLES OF DIFFERENT LENGTHS. THE ADJUSTABLE NOZZLE SHAFT WILL BE AVAILABLE WITH DIFFERENT OUTER DIAMETERS TO LET YOU CHOOSE THE BEST OPTION BASED ON YOUR GB SHELL.
THE NEXT ULTRA FEATURE IS THE INNER BARREL FASTENING MECHANISM. COMPARED TO THE STANDARD SOLUTION, WE HAVE COMPLETELY REDESIGNED THIS MECHANISM TO MITIGATE THE MAIN FLAW: THE C-CLIP FAILS TO HOLD THE BARREL IN PLACE (LONGITUDINAL MOVEMENT AND ROTATION). THIS NEW SYSTEM CONSISTS OF A RESHAPED C-CLIP IN POM AND A CUSTOM COUPLING NUT, WHICH HOLDS THE C-CLIP FIRMLY TO THE BARREL AND IS ALSO PRECISION-MACHINED TO RELIABLY CENTER THE INNER BARREL. WITH THIS SOLUTION, THE C-CLIP CANNOT LOOSEN WITH THE ROTATION OF THE BARREL AND THE BARREL CANNOT MOVE LONGITUDINALLY, AS IT IS TIGHTENED WITH THE COUPLING NUT. TIGHTEN THE NUT BY HAND ONLY! THE COUPLING NUT HAS A MAXIMUM OUTER DIAMETER OF 12.95 MM, WHICH SHOULD BE SUITABLE FOR MOST OUTER BARRELS, BUT MAKE SURE IT FITS BEFORE PURCHASING.
ANOTHER DIFFERENCE IS THE SHAPE OF THE MAIN SHAFT IN THE ULTRA CHAMBER. COMPARED TO THE BASIC AND PRO CHAMBERS, THE SHAPE OF THE BORE IS ADJUSTED IN THE AREA WHERE THE HOP-UP BUCKING IS LOCATED. IT IS FLAT AND STANDARD AEG BUCKINGS ARE INTENDED TO BE USED WITH THE INCLUDED RINGS. THESE RINGS FILL IN THE MISSING MATERIAL AND CAN BE ADJUSTED, FOR EXAMPLE BY SANDING, TO COMPENSATE FOR DIFFERENT HOP-UP BUCKING SIZES. ANOTHER REASON FOR THIS BORE IS TO ALLOW THE USE OF OUR NEW ROBUST HOP-UP BUCKING.