Agency Trade-In Daniel Defense DDM4 300S Complete Upper Receiver Group

Agency Trade-In Daniel Defense DDM4 300S Complete Upper Receiver Group

Daniel Defense
SKU:
0925GDC-DDM4300URG103-U
Availability:
Usually ships in 24 hours
$749.95
(5 reviews)
Width:
6.00 (in)
Height:
6.00 (in)
Depth:
32.00 (in)
Condition:
Used
Current Stock:
Description

 

Overview

10.3" barrel 1/7 Twist, .300BLK, Daniel Defense DDM4 Rail 9.0.

These agency-trade  complete upper receiver groups feature a 10.3" Daniel Defense barrel, Daniel Defense bolt carrier group, charging handle, and a Daniel Defense DDM4 Rail 9.0. These are used factory Daniel Defense upper receiver groups

Please note, these are used items - individual handling wear will vary slightly. Some units may feature various charging handles and/or muzzle devices. All sales are final. Please contact us before placing your order if you have any specific requests.

 

**Purchases of lower receivers may not be made in conjunction with upper receivers.  Orders of these items must be placed seperately. ALL NFA RULES APPLY.  Thank you***

Reviews

  • 3
    DD .300S SBR

    Posted by Zack on May 11th 2026

    Shipping was next day! When received was a little disappointed with how dirty the upper was, it looked like someone had just shot 1000 rounds through it without cleaning it. The brass deflector is pretty dinged up but I also bought this used. The muzzle break had mud on it like someone put it muzzle straight down on the ground. There was even some sort of grass sticking out of the picatinny rail when I pulled it out of the box. It did come with a DD bolt carrier group, what seems to be a standard PSA charging handle and a Magpul Angled Fore Grip (which was not expected). With how dirty it is i'm going to attempt a ultrasonic cleaner on it hopefully that cleans it up. I haven't shot it yet, but looking back I would probably still purchase this again, it just needs a serious deep cleaning.

  • 3
    Not bad, not great. See below.

    Posted by Nick on Apr 10th 2026

    Based on the other reviews I was expecting it to be in much better shape. It is definitely heavily used and was not really well cared for. Dings and snail trails all over the handguard and receiver, corrosion, carbon, and copper/lead on bolt and inside the receiver. Not rust but some other type of corrosion. I was able to get the corrosion, copper/lead fouling and carbon cleaned for the most part. Muzzle device was easy to remove with a soak, they must have used Rocksett to attach the QD brake. Overall, I would probably buy it again. Maybe I just got unlucky but it is a used product. If I wanted a guaranteed pristine example I would have bought a new one and it would have cost me another couple hundred dollars.

  • 5
    DD 300s

    Posted by Justin on Mar 6th 2026

    Customer service was excellent. The upper was in the mail the same day and looks like it's never been fired.

  • 5
    Great Deal

    Posted by Daniel Hungerford on Jan 19th 2026

    Exactly as described, great condition, the only noticeable blemish was on the brass deflector. Shipping was quick too.

  • 4
    Upper

    Posted by Noah F on Dec 16th 2025

    Very good condition for a Daniel Defense police trade in, absolute steal for the price.