Big Hole Upper Receiver Assembly

In stock


The Daniel Defense Big Hole Flat Top Upper is designed and built with a .315 front pin hole to fit the early Colt lowers with .315 front holes. This eliminates the need to use an offset pin, which requires 2 screwdrivers during assembly / disassembly of these rifles.  This upper comes with our .315 Push Pin, which makes the assembly / disassembly of the upper and lower quick and easy. It has a detent ball to hold the pin securely in place.


  • 7075-T6 Aluminum
  • Mil-Spec Type III Hard Coat Anodized
  • M4 Feed Ramps
  • T-Marks
  • Forward Assist
  • DD Logo Laser Engraved on Left Side
  • Includes .315 Push Pin with Ball Detent
  • Made in the USA!


More Information
Product Weight8.5 oz
ManufacturerDaniel Defense
Daniel Defense Satisfaction Guarantee
Guaranteed Satisfaction

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.

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  1. I recomend this to anyone with the old big hole Colt, upgrade to the A4 configuration with no modifications
    I've been looking for this option for my old Colt A2 HBAR for years
    fits like a glove, no rattle or movement. Has the M4 ramps to match the new barrel I ordered

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