RETROARMS NEW GEN CNC RECEIVER FOR M4 (RA-7144)

NEW GEN RECEIVER (BODY)
INSPIRED BY THAT OF FIREARMS
IN CNC MACHINED EN AW 7075 T651 (DURAL) ALUMINUM
WITH PROTECTIVE ANODIZATION AGAINST CORROSION
THE MATERIAL IS MUCH STRONGER THAN COMMON STEEL (590MPa VS 390MPa)
STANDARD 20mm TOP RAIL (MIL-STD-1913)
FOR M4/AR15 AIRSOFT REPLICAS
WEIGHT 465g
BLACK COLOR

THE TYPE C CNC RECEIVER (BODY) IS INSPIRED BY THE REAL AR15 (M4) FIREARM.
THIS CNC RECEIVER IS MADE FROM A SOLID BLOCK OF AIRCRAFT ALUMINUM EN AW 7075 T651, WHICH HAS BETTER STRENGTH (590 MPA) COMPARED TO COMMON STRUCTURAL STEEL (390 MPA).
THANKS TO THE MATERIAL USED, THIS RECEIVER HAS MUCH HIGHER DURABILITY COMPARED TO COMMON CAST ZINC-ALUMINUM ALLOY RECEIVERS.
PRODUCING ONE OF THESE CNC RECEIVERS REQUIRES A LOT OF TIME AND MATERIAL.
CNC RECEIVERS HAVE MUCH MORE MATERIAL ON EACH PART FOR BETTER STRENGTH AND RESILIENCE. THANKS TO THE EN AW 7075 T651 MATERIAL USED, OUR CNC RECEIVER IS VERY LIGHTWEIGHT AND RESISTANT TO BREAKAGE.
THANKS TO THE REINFORCED PARTS OF OUR RECEIVERS, THE UPPERS AND LOWERS FROM OTHER MANUFACTURERS ARE NOT INTERCHANGEABLE.

THE UPPER HAS A MIL-STD-1913 MILLED RIS RAIL.
IT IS POSSIBLE TO USE A CARRY HANDLE FROM AN ORIGINAL REPLICA, BUT WE RECOMMEND GETTING THE RETROARMS CARRY HANDLE.
THE SHELL DEFLECTOR AND FORWARD ASSIST PIN ARE MILLED TOGETHER WITH THE UPPER FROM A BLOCK OF ALUMINUM.
THE UPPER RECEIVER ALSO HAS A SPRING-MOUNTED DUST COVER, WHICH IS IN A NORMALLY CLOSED POSITION (INSTEAD OF NORMALLY OPEN), BUT CAN BE EASILY OPENED TO ACCESS THE HOP-UP CHAMBER.
THE HANDGUARD THREAD IS M31.5X1.5 AND THERE SHOULD BE NO PROBLEMS WITH THE INSTALLATION OF HANDGUARDS FROM OTHER MANUFACTURERS.
OUTER BARRELS CAN BE USED FROM RETROARMS, OR FROM ANY OTHER ORIGINAL REPLICA MANUFACTURED TO TOKYO MARUI STANDARD.

THE LOWER RECEIVER IS ALSO MILLED FROM A SOLID BLOCK OF AIRCRAFT ALUMINUM EN AW 7075 T651 AND IS SIGNIFICANTLY REINFORCED, FOR BETTER RESILIENCE AND PROTECTION AGAINST BREAKAGE.
WE RECOMMEND INSTALLING THE RETROARMS V2 GEARBOX IN THE LOWER RECEIVER.
WE CANNOT GUARANTEE THAT GEARBOXES PRODUCED BY OTHER MANUFACTURERS WILL WORK PROPERLY.
TO REMOVE “METALLIC” NOISES DURING FIRING, WE RECOMMEND INSTALLING THE INCLUDED RUBBER BUFFERS IN THE PRE-MILLED SLOTS, WHERE THEY SUPPORT THE GEARBOX AND METALLIC RESONANCE WILL BE REMOVED.
WE HAVE INCREASED THE SPACE IN THE LOWER RECEIVER FOR WIRING LEADING TO THE HANDGUARD.

LOWER AND UPPER RECEIVERS ARE CONNECTED BY SPECIAL WEDGE PINS, WHICH PUSH AGAINST EACH OTHER AND BOTH PARTS OF THE RECEIVER ARE PUSHED TOGETHER.
THIS REMOVES ALL PLAY IN THE RECEIVER AND ALSO ALL GAPS KNOWN FROM ALLOY CAST RECEIVERS.
THANKS TO ALL THIS AND ALSO TO THE HIGH QUALITY MATERIAL AND MANUFACTURING PROCESS, BOTH PARTS OF THE RECEIVER FIT PERFECTLY.
THE WEDGE PINS ARE FIXED WITH A SCREW, SO WITH MORE SCREWING, THERE IS MORE FORCE ON THE PINS.
THERE IS NO NEED TO USE BRUTE FORCE (MORE INFORMATION BELOW).
THE CENTER PIN IS ALSO SECURED BY A SCREW, SO IT WILL NOT FALL OUT.

THE STOCK IS INSTALLED ON A SPECIAL ADAPTER, WHICH CAN ACCEPT ANY STANDARD TM AR15 BUFFER TUBE.
THE ADAPTER CAN BE REPLACED WITH A QSC ADAPTER OR OUR CNC BUFFER TUBE WITH BAYONET MOUNT CAN BE INSTALLED.
ANY AR15 (M4) PISTOL GRIP CAN BE INSTALLED, IF MANUFACTURED ACCORDING TO TOKYO MARUI STANDARDS.
ALL RECEIVER ACCESSORIES SUCH AS END PLATE, FORWARD ASSIST PIN, MAGAZINE CATCH, BOLT CATCH, FIRE SELECTOR COVER, FIRE SELECTOR CAN BE REPLACED WITH ANY OTHER STANDARD PIECE FROM ORIGINAL REPLICAS, OR YOU CAN USE CNC ONES FROM RETROARMS OFFERING.
WE RECOMMEND INSTALLING THE RETROARMS CNC FIRE SELECTOR, BECAUSE IT HAS PRECISE SELECTION, SMOOTH MOVEMENT AND WORKS PERFECTLY IN ANY FIRE MODE.
THE USE OF THE RETROARMS END PLATE IS ALSO RECOMMENDED.

THIS CNC RECEIVER IS SANDBLASTED WITH SYNTHETIC CORUNDUM AND PROTECTED WITH HARD ANODIZING.
EN AW 7075 T651 MATERIAL IS VERY DIFFICULT TO ANODIZE DUE TO ITS HIGH STRENGTH AND HARDNESS; THE COMMON ANODIZING PROCESS IS NOT ABLE TO REACH DEEP ENOUGH INTO THE SURFACE.
IF WE DID NOT ANODIZE PRODUCTS MADE FROM THIS MATERIAL, THERE WOULD BE A HUGE RISK OF CORROSION (LARGE GRAY SPOTS WITH A ROTTEN APPEARANCE).
THANKS TO THE SANDBLASTING PROCESS THE SURFACE IS MATTE.
AFTER PURCHASE, WE RECOMMEND TREATING THE SURFACE WITH A LITTLE OIL ON A CLOTH.
THIS PROCESS WILL ALLOW THE SURFACE TO ABSORB SOME OF THE OIL AND WILL LEAVE A NICE DARK AND UNIFORM FINISH.

LOWER RECEIVER CHANGELOG:
REWORKED SHAPE OF THE REAR RADIUS AND PISTOL GRIP INSERTION – NOW MORE GRIPS ARE COMPATIBLE AND BETTER FITTED TO THE BODY
ADDED PROTRUSION/FENCE ON THE LEFT SIDE OF THE BODY AROUND THE MAGAZINE RELEASE – PROTECTION AGAINST INVOLUNTARY MAGAZINE RELEASE
REWORKED SHAPE OF THE MAGAZINE RELEASE GROOVE AND ADDED EDGE IN THE FRONT OF THE GROOVE AS A STOP FOR THE MAGAZINE RELEASE
REWORKED OVAL SHAPE FOR THE MAGAZINE RELEASE BUTTON
REWORKED SHAPE, POSITION AND DEPTH OF THE DETENTS FOR THE FIRE SELECTOR
IN THE LOWER AND REAR PART THERE ARE 3 PRECISE CONTACT SURFACES, WHICH KEEP THE GEARBOX ALIGNED.
ADJUSTED CENTER PIN POSITION – NOW THE BODY HOLE IS TANGENTIAL WITH THE GEARBOX HOLE AND PUSHES THE GEARBOX DOWN AND TOWARDS THE REAR ONTO THE CONTACT SURFACES
ADDED RUBBER BUFFERS TO MITIGATE METALLIC RESONANCE DURING FIRING
REWORKED SHAPE FOR THE FIRE SELECTOR COVER ON THE RIGHT SIDE
ADDED INDENTATION IN THE TOP OF THE REAR ARCH TO ALLOW EASIER GEARBOX INSTALLATION
ADDED POCKETS FOR HORIZONTAL GEARBOX ALIGNMENT
ADDED GROOVE ON THE FRONT OF THE MAGAZINE WELL
ADDED HOLE IN THE REAR ROUND PART FOR THE POSSIBILITY OF ADJUSTING THE REAR LIMIT STOP ON OUR NEWEST GEARBOXES WITH THE GEARBOX STILL IN THE RECEIVER
MANY SMALL DESIGN ADJUSTMENTS (CHAMFERS, RADII, SURFACE SHIFTS, ADJUSTED CONNECTION SHAPE ETC.)

UPPER RECEIVER CHANGELOG:
ADJUSTED CLEARANCE BETWEEN UPPER AND LOWER RECEIVER
FORWARD ASSIST SPRING PIN REPLACED BY M3X16 SET SCREW
REINFORCED TOP PART UNDER THE RIS RAIL
CHAMFERED EDGE UNDER THE RIS RAIL TO REDUCE SCRATCHES ON THE CHARGING HANDLE
ENLARGED CHAMFER FOR THE CHARGING HANDLE LATCH
REVISED POSITIONING OF THE CHARGING HANDLE
ADDED 2 RIS SLOTS
ADJUSTED GROOVES FOR OUTER BARREL CENTERING PINS
ENLARGED GROOVE FOR FRONT-WIRED CONFIGURATIONS
MANY SMALL DESIGN ADJUSTMENTS (CHAMFERS, RADII, SHIFTED SURFACES, ADJUSTED CONNECTION SHAPE ETC.)

THE CNC RECEIVER CAN BE INSTALLED AS A REPLACEMENT FOR THE ORIGINAL CAST ALLOY RECEIVER WITH TOKYO MARUI STANDARD.
WHEN INSTALLING THE GEARBOX DO NOT USE BRUTE FORCE.
USE A MAXIMUM TIGHTENING TORQUE OF 1 NM ON THE SCREWS, OTHERWISE THE SCREWS CAN BE STRIPPED OUT. THERE IS NO NEED TO TIGHTEN THE SCREWS WITH BRUTE FORCE, IF YOU WANT TO BE SURE THAT THE SCREWS DO NOT LOOSEN, USE THREADLOCKER OR PAINT.
THE INSTALLATION OF THE CNC RECEIVER AND THE GEARBOX REQUIRES PROFESSIONAL KNOWLEDGE, EXPERIENCE AND SKILLS.
THERE ARE MANY AIRSOFT MANUFACTURERS ON THE MARKET AND EACH OF THEM CREATES THEIR OWN DIMENSIONS, THERE ARE NO STANDARDS LIKE ISO ENGINEERING IN AIRSOFT.
THIS IS THE MAIN PROBLEM WITH MANY INTERNAL AND EXTERNAL PARTS FROM DIFFERENT MANUFACTURERS WHICH MAY BE THE SAME PRODUCT, BUT WITH DIFFERENT DIMENSIONS.
WE RECOMMEND USING ONLY PARTS FROM MANUFACTURERS WITH PARTS COMPATIBLE WITH TOKYO MARUI.

RECOMMENDED RECEIVER ASSEMBLY PROCEDURE:
INSERT A GEARBOX INTO THE LOWER RECEIVER WITH GLUED RUBBER BUFFERS
INSTALL THE CENTER PIN
INSTALL THE PISTOL GRIP AND LIGHTLY TIGHTEN THE SCREWS (THEY WILL BE TIGHTENED LATER)
INSTALL THE UPPER RECEIVER AND USE THE HORIZONTAL ALIGNMENT MECHANISM TO ALIGN AND TIGHTEN THE GEARBOX
REMOVE THE UPPER RECEIVER AND TIGHTEN THE PISTOL GRIP
INSTALL THE REAR BODY PIN
INSTALL THE QSC INSERT INTO THE BUFFER TUBE MOUNT
ASSEMBLE THE REST OF THE REPLICA ACCORDING TO YOUR PREFERENCES

PACKAGE INCLUDES:
CNC LOWER, CNC UPPER, CNC WEDGE PINS, CNC STOCK ADAPTER, CNC CENTER PIN, CNC FORWARD ASSIST, DUST COVER, SCREW SET, DUST COVER PIN, FORWARD ASSIST SPRING, DUST COVER SPRING.