M4 Rail 12.0 FSP, Carbine

M4 Rail 12.0 FSP, Carbine

M4 Rail 12.0 FSP, Carbine

Regular price: $346.00

Product Info

Quick Overview

The Daniel Defense 12.0 FSP Free Float Rail System features an opening in the top rail to accommodate the front sight post and gas block of a carbine length AR15 gas system. This precision cut-out provides much needed rail space along the top, sides, and bottom rails of the 12.0 FSP. 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.


The 12.0 FSP handguard is designed to work with the AR15 carbine gas system. The indexing pins are constructed from stainless steel while all other components are 6061-T6 aluminum. Every Daniel Defense Rail System is a Military Specification rail and are 100% Quality Assurance Tested for conformity.

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


The Daniel Defense M4Rail Handguard System was designed around these parameters:

  • Must be free float.
  • Must be light weight and strong.
  • Must be able to quickly dissipate heat.
  • Must feel like a conventional forearm (Oval not round).
  • Must lock to barrel nut or upper receiver to prevent spin.

Materials & Construction

Precision CNC machined from 6061 T6 aluminum and Military Specification Type III Hard Coat Anodized.

  • Material: Aircraft Grade 6061-T6 Aluminum
  • Finish: Military Specification Type III Hard Coat Anodized
  • Length: 12.5"
  • Width: 1.94"
  • Weight 13.1 Ounces
  • Inside Diameter: 1.45"
  • Made in the USA!

Installation Requirements

  • Daniel Defense M4 Threaded Ring Spanner Wrench 
  • Bench Vice
  • Upper Receiver Vice Block
  • Hammer
  • Punch Set
  • Torque Wrench
  • AR15 Multi-Tool

Warranty Statement

All Daniel Defense rail systems carries a 100% satisfactions 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 in correct installation of other manufacturer’s products. Be sure to retain your sales slip as proof of purchase date when making a claim.

Additional Information

SKU DD-1003
Manufacturer Number 01-001-01003
Product Weight 13.1 oz
Rail Length 12.5"
Width 1.94"
Inside Diameter 1.45"
Barrel Nut M4 - Aluminum
Gas System Length Carbine
Free Float Yes
Continuous Upper Rail No
Integrated Sling Swivel Attachment Point No
Manufacturer Daniel Defense