Daniel Defense
Daniel Defense MK18 RIS II
USSOCOM-adopted 9.55 in quad rail for MK18 CQBR clone builds
Quick Specs
- Price
- $582
- Weight
- 14.1 oz
- Brand
- Daniel Defense
- Category
- handguard
Features
- •Quad Rail Picatinny
- •9.55" length
- •Bolt-up system
- •1.15" inside diameter
Capability Boosts
Recommended For
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Where to Buy
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Daniel Defense MK18, URG, 5.56, 1/7, GOV, LPG, RIS II Rail, DDFS Complete Upper Receiver w/ Flash Hider, Black, 10.3in, 23-004-08013-006
Price History
90-day low $516.00Compatibility Tags
Overview
The Daniel Defense MK18 Rail Interface System II is the exact quad rail handguard used on USSOCOM's MK18 CQBR (Close Quarters Battle Receiver) weapon system. The RIS II family was rigorously tested by US Special Operations Command and adopted for the Block II SOPMOD program; the M203 free-float capability the family is known for belongs to the longer 12.25" M4A1 RIS II variant, while this 9.55" MK18 rail is the CQBR configuration.
Built from aircraft-grade 6061-T6 aluminum with Mil-Spec Type III hard coat anodizing, the RIS II features Daniel Defense's patented bolt-up mounting system using six bolts for rock-solid attachment. The gas port and stress-relieved metal surfaces prevent heat-related damage to the weapon during sustained fire. The 9.55" length is optimized for carbine-length gas systems with 10.3" barrels.
Installation requires removal of the delta ring, handguard cap, and front sight post, with a low-profile gas block required for proper clearance. The RIS II provides Picatinny rails at all four positions for maximum accessory mounting flexibility. Available in Black and Flat Dark Earth finishes.
Key Features
- USSOCOM Block II SOPMOD approved handguard
- Aircraft-grade 6061-T6 aluminum construction
- Mil-Spec Type III hard coat anodized finish
- Patented 6-bolt bolt-up mounting system
- Free-floats M203 grenade launchers without modification
- 9.55" length for carbine gas systems
- Ambidextrous sling swivel studs for monopod operation
Pros
- +Battle-tested by USSOCOM—the real deal for clone builds
- +Rock-solid bolt-up system with no rotation or flex
- +M203 compatible—rare feature for commercial rails
- +Full Picatinny coverage for maximum mounting options
- +Available in Black and FDE
- +Lifetime warranty from Daniel Defense
Cons
- −Heavy at 14.1 oz compared to M-LOK alternatives
- −Requires low-profile gas block (FSP removal)
- −Premium pricing for quad rail design
- −Quad rails add bulk compared to slim handguards
- −9.55" length limits suppressor tuck options
Detailed Specifications
- Material
- Aircraft-grade 6061-T6 aluminum
- Finish
- Mil-Spec Type III hard coat anodized
- Length
- 9.55 inches
- weight
- 14.1 oz
- width
- 2.23 inches
- Inner Diameter
- 1.15 inches
- mountingSystem
- Patented 6-bolt bolt-up system
- Rail Type
- Picatinny quad rail
- gasSystemCompatibility
- Carbine length (requires low-profile gas block)
- m203Compatible
- Yes—free-floats M203 without modification
- slingMounts
- Ambidextrous sling swivel studs
- madeIn
- USA
- colors
- Black, Flat Dark Earth (FDE)
- blackSku
- 01-004-08020-006
- fdeSku
- 01-004-08020-011
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