AR15 Lite Rail™ 12.0 FSPM, Mid-length

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The Daniel Defense AR15 Lite Rail™ 12.0 FSPM is the next advancement in the free float rail systems. The AR15 Lite Rail 12.0 FSPM weighs in at only 13.6 ounces and utilizes a steel barrel nut! The patented Bolt Up System&trade allows for an uninterrupted upper rail platform.


The Daniel Defense 12.0 FSPM Free Float Rail System features an opening in the top rail to accommodate the front sight post and gas block of a mid length AR15 gas system. This precision cut-out provides much needed rail space along the sides, and bottom rails of the 12.0 FSPM. The rifle’s front sight post protrudes through this opening but does not diminish the useable mounting area on the rail that extends beyond the gas block and over the carbine’s barrel. This extra “real-estate” is a perfect location for aiming devices, flashlights, and laser sights.


Every rail comes with your choice of ladders or panels are made from santoprene, which can handle heat up to 350 degrees.

  • Free Floating Barrel Design
  • Uninterrupted Upper Rail Platform
  • Aircraft Grade Aluminum
  • Hardened Steel Barrel Nut
  • Grade 8 Military Specification Fasteners
  • Mil-Spec 1913 Picatinny Rails

Materials & Construction

Precision CNC machined from Aircraft Grade 6061-T6 Aluminum and Military Specification Type III Hard Coat Anodized for a rock hard lasting finish. The AR15 Lite Rail™ weighs in at an amazing 13.5 ozs.

  • Material: Aircraft Grade 6061-T6 Aluminum
  • Finish: Military Specification Type III Hard Coat Anodized
  • Length: 12.65"
  • Width: 2.06"
  • Weight 13.5 Ounces
  • Inside Diameter: 1.22"
  • Made in the USA!

Installation Requirements

Our Bolt Up System Barrel Nut Wrench is required for installation

Warranty Statement

All Daniel Defense rail systems carries a 100% satisfaction guarantee against defects in original materials and workmanship. If your Daniel Defense rail system shows evidence of such defects, Daniel Defense will make every accommodation to fix, repair, or replace your rail system in the most expeditious and inexpensive 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.

Additional Information

Manufacturing # / SKU 01-002-02005
Restricted Shipping Yes
Product Weight 13.5 oz
Rail Length 12.65"
Width 2.06"
Height No
Inside Diameter 1.22"
Barrel Nut Steel (For Patented Bolt-Up System)
Gas System Length MId-length
Free Float Yes
Continuous Upper Rail Yes
Integrated Sling Swivel Attachment Point No
Manufacturer Daniel Defense