Caliber Marked Dust Cover Assembly 300 Blackout

Name: Caliber Marked Dust Cover Assembly 300 Blackout
Brand: Yankee Hill Machine
Availability: InStock

Yankee Hill Machine · Upper Parts

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Caliber Marked Dust Cover Assembly 300 Blackout

Best price

$15.50at Brownells

In stock Lowest in 30 dayschecked Nov 13, 2026

Buy at Brownells

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Fits and works with

Caliber: 300 Blackout · Shop matching ammo
Bolt: Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups

Specifications

Manufacturer: Yankee Hill Machine
Color: Black
Type: Ejection Cover
Platform: AR-15

Where to buy

Store	Price	Availability	Buy
Brownells Best price 17.76% off · ends Nov 15 · exclusions apply	$15.50checked Nov 13, 2026	In stock	Buy at Brownells
MidwayUSA	$15.50checked Nov 13, 2026	In stock	Buy at MidwayUSA
OpticsPlanet	$16.99Salechecked Nov 13, 2026	In stock	Buy at OpticsPlanet
Ammunition Depot	$19.49checked Nov 13, 2026	In stock	Buy at Ammunition Depot
Battlehawk Armory	$11.91Salechecked Nov 13, 2026	Check store	Buy at Battlehawk Armory
GrabAGun	$14.39Salechecked Nov 12, 2026	Check store	Buy at GrabAGun
Palmetto State Armory	$15.99checked Nov 11, 2026	Check store	Buy at Palmetto State Armory
GunMag Warehouse	$17.99checked Oct 20, 2026	Out of stock	Buy at GunMag Warehouse

Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.

Price history

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Lowest in-stock price in the last 30 days: $15.50 at Brownells. Dashed line = out of stock. Tracking since Sep 27, 2026.

Show the prices as a table

Store	Latest	Lowest	Highest
Ammunition Depot	$19.49	$17.49	$21.99
Battlehawk Armory	$11.91	$11.91	$12.25
Brownells	$15.50	$15.50	$15.50
GrabAGun	$14.39	$14.39	$14.39
GunMag Warehouse	—	$17.99	$17.99
MidwayUSA	$15.50	$15.50	$15.50
OpticsPlanet	$16.99	$16.99	$16.99
Palmetto State Armory	$15.99	$15.99	$15.99

Since Sep 27, 2026.

About this part

The Caliber Marked Dust Cover Assembly 300 Blackout is an AR-15 upper part from Yankee Hill Machine. It's sold by 8 stores (4 in stock), from $11.91 to $19.49. The lowest in-stock price in the last 30 days was $15.50 at Brownells.

From the manufacturer

YHM has long been a supplier of Caliber Marked upper receivers, but they soon asked themsleves ""What if we want to change the caliber of that upper receiver?"" For this reason, they now offer caliber marked dust covers for those who may end up changing the caliber of their top end/upper receiver. SPECIFICATIONS Assemblies Include the following: Caliber Marked Dust Cover Rod and Retaining Clip Spring Mfg: Yankee Hill Machine Co., Inc.