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For other carbine variants of the M16, see M4 and CAR-15
For the other AR-15 derivatives in Siege, see 416-C Carbine, C8-SFW, C7E, M4 and Commando 9

"FBI SWAT standard issue assault rifle. Highly customizable, for medium to long range conflict."
— In-game description

The R4-C is an assault rifle featured in Tom Clancy's Rainbow Six Siege. It is available for use by Ash.


The Remington R5 RGP is an M4 carbine designed and manufactured by Remington Arms. It is one of many AR-15 type rifles which uses a gas piston operating system in an attempt to improve the reliability of the weapon.

In-game, the R4-C is a fast firing assault rifle designed for close-to-mid range engagements, contrary to the quote above. Its high damage and high rate of fire make it highly lethal in close to medium range engagements. However, despite the weapon's superior damage dropoff that grants a fast TTK at all ranges, its high recoil and the lack of a magnifying scope can make long-range engagements somewhat difficult.


  • High rate of fire
  • High damage output
  • Low horizontal recoil


  • Lacks Angled Grip and magnifying scopes
  • High vertical recoil

Weapon Attachments[]

Under Barrel

Learning Area[]

In the Suburban Extraction Situation, the player plays as a FBI SWAT Recruit equipped with an R4-C with the NATO Holographic Sight, Flash Hider, Vertical Grip, and a 5.7 USG as a sidearm.



  • On the default weapon skin, the words "Pew Pew" and "Auto" are written in red text on the left and right side of the fire selector settings respectively.
  • In the Sugar Fright limited-time event, the Scope 2.0x was available for the R4-C.

Patch Changes[]