Daniel Defense MK18 10.3" 5.56 NATO Complete Upper Receiver - RIS II - Multiple Colors
or 4 interest-free payments of $381.75 with 
6 Magazines Per Order: Due to extreme volume, we are limiting sales of magazines to 6 per customer order. This applies to individual and bundled magazines. AT3 reserves the right to cancel any order over the 6 magazine limit.
- Free standard shipping on orders $139+ details
- 90-day no-hassle returns policy
- Backed by the Daniel Defense Warranty! what it covers
Product description
Daniel Defense MK18 10.3″ Complete Upper – RIS II Quad Rail & 5.56 BCG
Features
- Complete MK18 Upper Receiver Group chambered in 5.56 NATO
- 10.3″ cold hammer forged Government-profile barrel with chrome-lined bore and chamber
- 1:7 twist rate supports a broad range of common 5.56 NATO and .223 Rem ammunition
- Carbine-length direct impingement gas system with pinned low-profile gas block
- Daniel Defense RIS II MK18 free-float quad rail provides full-length Picatinny accessory mounting
- RIS II uses Daniel Defense’s Bolt-Up mounting system originally developed for the USSOCOM rail program
- Includes M16-profile bolt carrier group with chrome-lined carrier and properly staked gas key
- GRIP-N-RIP ambidextrous charging handle provides left- or right-side manipulation and incorporates gas-redirecting features
- Daniel Defense flash suppressor comes installed at the muzzle
- Includes heat-resistant Santoprene rail panels rated to 300°F
- Available in Black and Flat Dark Earth finish configurations
The Daniel Defense MK18 Upper Receiver Group packages the classic RIS II quad rail around a 10.3″ cold hammer forged 5.56 NATO barrel and carbine-length gas system. It arrives as a complete upper with the M16-profile BCG, ambidextrous GRIP-N-RIP charging handle, flash suppressor, and rail panels already included. The RIS II provides the rigid full-Picatinny layout associated with the original MK18 configuration while the compact barrel keeps overall upper length to a minimum.
Specifications
- Brand: Daniel Defense
- Model: MK18 Upper Receiver Group
- Caliber: 5.56 NATO / .223 Rem
- Barrel Length: 10.3″
- Barrel Profile: Government
- Twist Rate: 1:7
- Bore / Chamber: Chrome lined
- Barrel Manufacturing Method: Cold hammer forged
- Gas System: Carbine-length direct impingement
- Gas Block: Pinned low-profile, 4140 hardened steel
- Upper Receiver: 7075-T6 aluminum, Type III hardcoat anodized, M4 feed ramps
- Handguard: Daniel Defense RIS II MK18 free-float Picatinny quad rail
- Bolt Carrier Group: M16 profile, MP tested, chrome lined, properly staked gas key
- Charging Handle: Daniel Defense GRIP-N-RIP ambidextrous
- Muzzle Device: Daniel Defense Flash Suppressor
- Sights: Not included
- Weight: 56 oz
- Finish / MPN:
- Black – 23-004-08013-006
- Flat Dark Earth – 23-004-08013-011
What’s Included
- 1x Daniel Defense MK18 10.3″ Upper Receiver Group in selected finish
- 1x Daniel Defense M16-profile bolt carrier group
- 1x Daniel Defense GRIP-N-RIP ambidextrous charging handle
- 1x Daniel Defense Flash Suppressor
- Daniel Defense Santoprene rail panels
All 2 options on this page
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Questions & Answers
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Warranty & returns
Backed by the Daniel Defense Warranty!
Daniel Defense Warranty
All Daniel Defense products carry a 100% satisfaction guarantee against defects in original materials and workmanship.
If your Daniel Defense product shows evidence of such defects, Daniel Defense will make every accommodation to fix, repair, or replace your product in the most expeditious manner possible.
Daniel Defense does not warranty products or damage caused to our products by the correct or incorrect installation of other manufacturer’s products.
Be sure to retain your sales slip as proof of purchase date when making a claim.
Requirements
- Please use the form below to contact our Warranty department to create an RMA prior to shipping items to ensure they are processed in a timely fashion.
- Merchandise must be in new condition with the original packaging.
- Merchandise must be return-shipped in a protective box.
- A full refund including shipping if the return resulted from our error.
- Otherwise, we will deduct the shipping costs from your refund.
- Refunds for items purchased directly from Daniel Defense will be returned to the original purchase method.
- Refunds for items purchased through our Financing Partner, Expert Voice, or other special programs, will be credited to those partners who will refund customers directly (processing times may vary).
- Any other refunds will be issued via Check delivered by USPS.
- Please provide a copy of the receipt or sales order number to expedite the process.
- The customer will receive a refund within 10 business days of our receiving your return.
Faulty Products
If the product has been used in accordance with the manufacturer’s instructions, but is faulty, unfit for purpose, or does not match the sample or description please return the product to us with a copy of your invoice. We may send the product to the manufacturer’s service agent for assessment. Where the product is determined faulty or unfit for purpose we will provide you with a refund or exchange.
Disclaimer: Manufacturer’s warranty is subject to change without prior notice.
90-day no-hassle returns
The AT3 Tactical store has a 90 day no-hassle return policy for products in good condition. You can view the full details of our return policy here.
If you encounter an issue or defect with a product after 90 days of your purchase, you can refer to the manufacturer for a warranty claim. Their policies are below.