Daniel Defense
Daniel Defense MK12 Upper Receiver Group 18"
Precision 18" stainless steel URG with MK12 barrel profile and rifle-length gas system.
Quick Specs
- Price
- $1,681
- Weight
- 5 lb 3.7 oz
- Brand
- Daniel Defense
- Category
- upper
Features
- •5.56 NATO
- •18" stainless steel CHF barrel
- •Rifle-length gas
- •DDM4 Rail 12.0 quad rail
- •BCG & GRIP-N-RIP CH included
Capability Boosts
Recommended For
Compatibility Tags
Overview
The Daniel Defense MK12 Upper Receiver Group is purpose-built for precision applications, featuring an 18" stainless steel barrel with the MK12 profile that made the original SPR (Special Purpose Rifle) famous. The barrel is cold hammer forged with the chamber created during the forging process, ensuring the most precise alignment of chamber to bore possible. A DLC (Diamond-Like Carbon) finish provides unprecedented accuracy and durability.
The MK12 barrel is engineered with a rifle-length direct impingement gas system, providing the smoothest possible cycling with reduced bolt carrier velocity and extended component life. The MK12 gas block is built to Crane Specifications for USSOCOM, precision CNC machined from 416 stainless steel with black oxide coating.
The upper is equipped with a free-floating DDM4 Rail 12.0 quad rail handguard, providing full Picatinny coverage for optics, bipods, and accessories essential for precision shooting. Every MK12 ships complete with Daniel Defense's M16 profile bolt carrier group (MPI tested, chrome lined) and the GRIP-N-RIP ambidextrous charging handle with anti-gas features.
Key Features
- ✓18" stainless steel barrel, cold hammer forged, DLC finished
- ✓MK12 barrel profile for precision applications
- ✓Rifle-length gas system for smooth cycling
- ✓MK12 gas block built to Crane/USSOCOM specifications
- ✓DDM4 Rail 12.0 free-float quad rail handguard
- ✓M16 profile BCG, MPI tested with properly staked gas key
- ✓GRIP-N-RIP ambidextrous charging handle with anti-gas features
- ✓Daniel Defense flash suppressor included
Pros
- +Stainless steel barrel delivers exceptional accuracy
- +DLC finish extends barrel life significantly
- +Rifle-length gas is smoothest cycling option
- +MK12 profile optimized for precision shooting
- +Crane-spec gas block matches military SPR builds
- +Complete package with BCG and charging handle
Cons
- −Premium pricing for precision configuration
- −18" barrel adds length and weight (5.23 lbs)
- −Quad rail heavier than M-LOK alternatives
- −Stainless barrel may not be ideal for high round count
- −Not suppressor-optimized like shorter gas systems
Detailed Specifications
- caliber
- 5.56x45mm NATO
- barrelLength
- 18"
- barrelProfile
- MK12
- barrelMaterial
- Proprietary Stainless Steel Blend, Cold Hammer Forged
- barrelFinish
- DLC (Diamond-Like Carbon)
- twist
- 1:7
- gasSystem
- Rifle Length, Direct Impingement
- gasBlock
- MK12 Low Profile, 416 SS, Black Oxide (Crane Spec)
- handguard
- DDM4 Rail 12.0, Quad Rail, Free-Float
- upperReceiver
- 7075-T6 Aluminum, Type III Hard Coat Anodized
- bcg
- M16 Profile, MPI Tested, Chrome Lined
- chargingHandle
- GRIP-N-RIP, Ambidextrous, Anti-Gas
- muzzleDevice
- DD Flash Suppressor, 17-4 PH SS, Salt Bath Nitride
- threadPitch
- 1/2x28
- weight
- 5.23 lbs
- madeIn
- USA
Compatible Platforms
+171 morePairs Well With
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4 shared compatibility tags
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Sig Sauer
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3 shared compatibility tags
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3 shared compatibility tags
Springfield Armory
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3 shared compatibility tags
Springfield Armory
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3 shared compatibility tags
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Build Your Custom Configuration
Add the Daniel Defense MK12 Upper Receiver Group 18" to your build and see how it enhances your platform.