****Due to our payment processing service(that will not allow us to sell Firearm parts) please use Paypal when ordering anything firearms related.****


Our Criteria when designing this upper/rail system

-Rail Must Be Constructed From American Made 7075-T6 Aluminum

-Increased Strength Over Other Market Offerings with reduced flex

-Narrowing At Point Of Contact With Upper Receiver for smooth transisition

-Titanium Barrel Nut That Does Not Require Indexing/Timing Or Shims

-Integrated Built In heavy duty Anti-Rotation lug

-Designed with under rail Suppressor installation in mind. 1.750" ID Diameter, Should handle all .30 Caliber suppressors on market

-Options for Increased Grip Without Requiring The Addition Of Grip Panels V1.1 milled in sereations
V1.2 M-lok only, no serations

-M-LOK slots are counter bored on ID for easy M-LOK installation with minimum possible interference

-Upper must accomidate multiple Calibers. G4 upper handles rimfire up to .50 Beowulf. G9 upper works with 9mm, 7.62x25, .357 Sig, .40 S&W, 10mm Auto and .45 ACP, just to name a few!

-Availableas matched set in multiple Cerakote colors


Icarus Rail spec

7075-T6 Billet Aluminum Rail Specifications:

Finish- CeraKote High Temp
12" V1.1 M_LOK Rail Weight(No barrel nut or hardware): 10.79oz
Titanium Barrel Nut(2" long): 1.2oz
316 Stainless Pinch Plate w/ Stainless 8/32" Hex Screws: .71oz
Total System Weight: 12.70oz

GIBBZ Arms upper
– GIBBZ Arms Patent Pending Left Side Charging Handle
– Non-reciprocating with detent to keep the charging handle forward during operation
– Uses all Mil-Spec and most Custom Bolt Carriers without modification
– Beveled Ejection Port
– Full 15 Slot Picatinny Rail
– Rear Bolt carrier door to allow for easy bolt carrier removal and still keeping gasses in during operation (important for suppressed fire)
– Compatible with Mil-Spec and most other lower receivers.
– Included is our Enhanced Cam Pin which is optimized for our side charging upper with Melonite coating.
– Charging handle cover for keeping operating gasses in (also important for suppressed fire)
– Manufactured in the USA.


IMPORTANT!! You MUST use the G4 Enhanced Cam Pin in the G4 Side Charging Uppers!
Use of a Standard Cam Pin will cause the Bolt Carrier Group to lock up in the G4 Upper Receiver and be VERY difficult to remove and could damage the Upper Receiver.

G4 Multical Upper reciever, 12" Rail W/ 2"Titanium Barrel Nut


    Contact Us!!

    **Icarus Precision LLC is not responsible for any property or personal injury/damage incurred using our products.** 


    **Due to ITAR Regulations, the exportation of firearms, ammunition, and firearm accessories is heavily regulated in the U.S.  We are not registered with Department of State as an exporter, therefor we cannot ship any of our products outside the U.S. We cannot and will not ship to a freight forwarder who then ships outside the U.S. either.**