Rooftop Defense RDM4 16″ Rifle, 5.56 – MLOK, Black


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Rooftop Defense RDM4 16″ Rifle, 5.56 – MLOK, Black

The RDM4 is a lightweight carbine built to provide outstanding accuracy and performance for both law enforcement and the law-abiding citizen.

At the heart of our rifle is a Criterion Core barrel. Their Core barrels are renown for providing exceptional accuracy in a balanced taper profile across a widespan of ammunition. I guarantee our rifles to reliably produce sub-MOA groups with Black Hills 77gr Open Tip Sierra Match Kings. Every RDM4 comes with a test target as part of our accuracy guarantee.

Paired with the barrel, is our bolt carrier group. We start with the industry standard, Microbest bolt carrier group, as the OEM. We thoroughly inspect and quality check every bolt carrier group before installing Sprinco components to ensure more reliable extraction and more positive ejection.

The Geissele SSA is our choice of trigger. It comes with a very familiar M4 curved feel with a tactile and predictable 4.5 pound break. The SSA has proven itself to be the gold standard in duty and self-defense applications.

The RDM4 lower is precision machined from 7075-T6 aluminum and features a VLTOR A5 buffer system. Utilizing a rifle length spring, the A5 buffer system spreads the load across more coils of spring with a buffer that has internally biased weights. This produces a more consistent action and more reliable function, effectively eliminating bolt bounce.

Rounding up the package is a 15” RDM4 Wedgelock rail. Traditionally, Wedgelock rails feature limited MLOK mounting surfaces. Now, seven sides of MLOK mounting surfaces are available. No T markings on the upper receiver or handguard.


  • Length Collapsed: 33.75″
  • Length Extended: 36.875″
  • Weight: 6 lbs 9 oz
  • Caliber: 5.56mm
  • Color: Matte Black
  • Lower Receiver: RDM4 Lower, Forged Milspec
  • Upper Receiver: RDM4 Upper, Forged Milspec
  • BCG: RDM4 (Microbest OEM)
  • Bolt: Carpenter 158
  • Rail: 15″ RDM4 Wedgelock
  • Trigger: Geissele SSA
  • Barrel: Criterion Core 16″ .223 Wylde Midlength Barrel, 1:8 Twist
  • Gas System: Midlength
  • Charging Handle: Raptor-LT
  • Muzzle Device: HUXWRX Flash Hider QD 556
  • Buffer System: VLTOR A5H2 & Sprinco Green Spring
  • Stock: B5 Systems Enhanced SOPMOD Stock w/ QD Endplate
  • Grip: Magpul MOE


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