NEW GEN CNC BODY FOR M4 RETRO ARMS (RA-7144)

Receiver (body) new gen
inspired by that of firearms
in aluminum en aw 7075 t651 (dural) cnc machined
with protective anodization against corrosion
the material is much more resistant than common steel (590mpa versus 390mpa)
20mm standard top rail (mil-std-1913)
for airsoft m4/ar15 replicas
weight 465g

The cnc (body) type c receiver is inspired by the real ar15 (m4) firearm.
This cnc receiver is made from a solid block of aircraft grade aluminum en aw 7075 t651, which has better strength (590 mpa), than common construction steel (390 mpa).
Thanks to the material used, this receiver has a much longer lifespan than common cast zinc-aluminum alloy receivers.
Producing one of these cnc receivers takes a lot of time and material.
The cnc receivers have much more material on each part for better strength and resilience. Thanks to the material used en aw 7075 t651, our cnc receiver is very light and resistant to braking.
Thanks to the reinforced parts of our receivers, the upper and lower parts of other manufacturers are not interchangeable.
The top has a milled mil-std-1913 ris rail.
It is possible to use a carrying handle from an original replica, but we recommend getting the retroarms carrying 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 the normally closed position (rather than 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 installing handguards from other manufacturers.
The outer barrels can be used from retroarms, or any other original replica, manufactured by Tokyo Marui standard.
The lower receiver is also milled from a solid block of EN AW 7075 T651 aircraft aluminum and is significantly reinforced, for improved resilience and protection from breakage.
We recommend installing the retroarms v2 gearbox in the lower receiver.
We cannot guarantee that gearboxes produced by other manufacturers will function properly.
To remove the "metallic" noises when firing, we recommend installing the included rubber pads into the pre-milled slots, where they support the gearbox and the metallic resonance will be removed.
We increased the space in the lower receiver for wiring, leading to the handguard.
The 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 the play in the receiver and also all the gaps we are familiar with from cast alloy receivers.
Thanks to all this and also to the high-quality material and manufacturing process, both parts of the receiver fit perfectly.
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 on this below).
The center pin is also fixed by a screw, so it won't fall off.
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 it is manufactured 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 parts from original replicas, or you can use cnc ones from retroarms offer.
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 is protected with hard anodizing.
The material en aw 7075 t651 is very difficult to anodize because of its high strength and hardness, the common anodizing process can not reach the surface deeply enough.
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 opaque.
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 leave a nice dark, even finish.
Lower Receiver Change Log:
reworked shape of the rear radius and pistol grip insertion - now more grips are compatible and better adapted to the body
an added protrusion/fence on the left side of the body around the magazine release - protection against inadvertent magazine release
reworked shape of the magazine release groove and added edge at the front of the groove as a magazine release stop
reworked shape of the oval for the magazine release button
Reworked shape, position and depth of the fire selector teeth
At the bottom and rear there are 3 precise contact surfaces, which keep the gearbox in line.
Adjusted position of the center pin - now the body hole is tangentially with the gear hole and pushes the gear down and back onto the contact surfaces
rubber drums added to mitigate metallic resonance during firing
reworked shape for the fire selector cover on the right side
added recess at the top of the rear arch to allow for easier shifter installation
added pockets for horizontal gear alignment
groove added on the front of the magazine well
added hole in rear round portion for ability to adjust rear end stop on our newer shifters with shifter still in receiver
many small design adjustments (chamfers, radii, surface displacement, adjusted link shape etc.)
Upper Receiver Change Log:
Adjusted play between upper and lower receiver
Spring pin for forward assist replaced by m3x16 adjustment screw
reinforced upper part under the guide rail
chamfered edge under the riser guide to reduce scratches on the charging handle
enlarged bevel for the charging handle stop
revised positioning of a charging handle
added 2 res slots
Adjusted grooves for outer bar centering pins
enlarged groove for front wiring configurations
many small design adjustments (chamfers, radii, moved surfaces, adjusted link shape etc.)
The cnc receiver can be installed as a replacement for original cast alloy receiver with Tokyo Marui standard.
Do not use brute force when installing the gearbox.
Use a maximum tightening torque of 1nm on the screws, otherwise the screws can be pulled 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 thread glue or paint.
Installing cnc receiver and gearbox requires professional knowledge, experience and skill.
There are many airsoft manufacturers in the market and each of them makes their own sizes, there is no standard like iso engineering in airsoft.
This is the main problem with many internal and external parts from different manufacturers that may be the same product, but with different dimensions.
We recommend using only parts from manufacturers with Tokyo Marui compatible parts.
Recommended receiver assembly procedure:
insert a gearbox into the lower receiver with rubber pads glued on
Install the center pin
Install the pistol grip and tighten the screws lightly (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 holder
assemble the rest of the replica according to your preferences
Package Included:
cnc lower part, cnc upper part, cnc wedge pins, cnc stock adapter, cnc center pin, cnc feed assist, dust cover, screw set, dust cover pin, spring feed assist, dust spring.