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PMAG 20 Ar300 B Gen M3 .300 AAC Blackout 20rd For AR15 Black

PMAG 20 Ar300 B Gen M3 .300 AAC Blackout 20rd For AR15 Black

Magpul · Magazines

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Best price

$12.99at Kentucky Gun Co

In stock Lowest in 30 dayschecked Nov 10, 2026

Buy at Kentucky Gun Co

Compare 16 stores

Where to buy

StorePriceAvailabilityBuyAdd to build
Kentucky Gun Co Best price $12.99checked Nov 10, 2026 In stock Buy at Kentucky Gun Co
GunMag Warehouse $13.99checked Nov 10, 2026 In stock Buy at GunMag Warehouse
Sportsman's Warehouse $14.99checked Nov 10, 2026 In stock Buy at Sportsman's Warehouse
OpticsPlanet $15.75Salechecked Nov 10, 2026 In stock Buy at OpticsPlanet
MidwayUSA $16.10checked Nov 10, 2026 In stock Buy at MidwayUSA
Ammunition Depot $18.49checked Nov 10, 2026 In stock Buy at Ammunition Depot
Battlehawk Armory $13.48Salechecked Nov 10, 2026 Check store Buy at Battlehawk Armory
AR15Discounts $13.95Salechecked Nov 10, 2026 Check store Buy at AR15Discounts
Dirty Bird $15.15checked Nov 10, 2026 Check store Buy at Dirty Bird
Classic Firearms $15.15checked Nov 10, 2026 Check store Buy at Classic Firearms
Magpul $15.95checked Nov 10, 2026 Check store Buy at Magpul
T.Rex Arms $16.00checked Nov 10, 2026 Check store Buy at T.Rex Arms
Guns.com $16.10checked Nov 10, 2026 Check store Buy at Guns.com
Palmetto State Armory $16.99checked Nov 10, 2026 Check store Buy at Palmetto State Armory
Bereli $22.99checked Nov 10, 2026 Check store Buy at Bereli
Brownells $12.99checked Nov 10, 2026 Out of stock Buy at Brownells

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

Lowest in-stock price in the last 30 days: $12.99 at Kentucky Gun Co. Dashed line = out of stock. Tracking since Sep 28, 2026.

Show the prices as a table
StoreLatestLowestHighest
AR15Discounts$13.95$13.95$13.95
Ammunition Depot$18.49$18.49$22.99
Battlehawk Armory$13.48$13.48$13.48
Bereli$22.99$22.99$22.99
Brownells$12.99$12.99$12.99
Classic Firearms$15.15$15.15$15.15
Dirty Bird$15.15$15.15$15.15
GunMag Warehouse$13.99$13.99$13.99
Guns.com$16.10$16.10$16.10
Kentucky Gun Co$12.99$12.99$12.99
Magpul$15.95$15.95$15.95
MidwayUSA$16.10$16.10$16.10
OpticsPlanet$15.75$15.75$15.75
Palmetto State Armory$16.99$16.99$18.99
Sportsman's Warehouse$14.99$14.99$14.99
T.Rex Arms$16.00$16.00$16.00

Since Sep 28, 2026.

About this part

The PMAG 20 Ar300 B Gen M3 .300 AAC Blackout 20rd For AR15 Black is a 300 Blackout magazine from Magpul. It's sold by 16 stores (6 in stock), from $12.99 to $22.99. The lowest in-stock price in the last 30 days was $12.99 at Kentucky Gun Co.

Fits and works with

Caliber
300 Blackout · Shop matching ammo

Specifications

Manufacturer
Magpul
Color
Black
Platform
AR-15
Caliber
300 Blackout

From the manufacturer

Magpul took inspiration from its PMAG 30 AR 300 B design, which was built specifically to give you a clearly labeled magazine designed to function perfectly with 300 Blackout rounds. The new PMAG 20 AR 300 B design incorporates all of Magpul's GEN 3 upgrades, and it gives you a more compact magazine that works well with your small rifle-caliber platforms. In addition to its smaller size, the Magpul PMAG 20 AR 300 B design gives you a safer way to shoot. Since the 300 Blackout functions in 5.56 NATO magazines and vice-versa, the risk of chambering a 300 Blackout round in your 5.56 NATO rifle is higher, and that can lead to a catastrophic malfunction. This PMAG has been designed wi Mfg: Magpul

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$12.99 at Kentucky Gun Co
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