Magpul PMAG 20 AR 300 B GEN M3 300 BLK Magazine
Mix and match across the range: 2 items save 5%, 3 save 10%, 4 or more save 15% on your whole basket.
Compatible with all PMAG accessories and Tactile Lock Plates.
Not sure it fits your rifle? Ask us before you order
When your rifle is chambered in 300 Blackout, you need a magazine specifically built for that round. The PMAG 20 AR 300 B GEN M3 delivers the same consistent feeding across the wide range of 300 BLK projectile weights and profiles as our 30-round 300 BLK PMAG, but with a 20-round capacity and a more compact package for better manoeuvrability and prone use.
300 BLK capabilities and reliability in a compact AR15 PMAG.
The distinct rib and unique upper texture also provide instant visual and tactile differentiation from 5.56 magazines to reduce cross-loading. With GEN M3 materials and engineering, it pairs impact- and crush-resistant polymer with proven feeding geometry for dedicated 300 BLK performance you can trust. Made in the USA.
Compatible with all PMAG accessories and Tactile Lock Plates.
| Brand | Magpul |
|---|---|
| Product | PMAG 20 AR 300 B GEN M3 300 BLK Magazine |
| Type | Magazine |
| Platform | AR-15 |
| Colour | Black |
| Material | Polymer |
| Origin | Made in USA |
| MPN | MAG1182 |
Genuine Magpul, ready to fit. Order the Magpul PMAG 20 AR 300 B GEN M3 300 BLK Magazine today — ordered in from the manufacturer for you and sent by Royal Mail Tracked 24, with delivery in 7–10 business days.
Explore more: AR-15 Parts & Accessories or browse all Magpul.
| Brand | Magpul |
|---|---|
| Product | PMAG 20 AR 300 B GEN M3 300 BLK Magazine |
| Type | Magazine |
| Platform | AR-15 |
| Colour | Black |
| Material | Polymer |
| Origin | Made in USA |
| MPN | MAG1182 |
| Category | Magazine |
| Barcode | 840815132233 |
£5 tracked UK delivery on every order via Royal Mail Tracked 24. Our products are ordered in from the manufacturer rather than held in UK stock, so please allow 7 to 10 business days (Monday to Friday, excluding bank holidays) from the date of your order for it to reach you. Tracking details are emailed on dispatch. UK delivery only.
You have 30 days from receiving your order to cancel it for any reason, then 14 days to send it back unused and in its original packaging. Faulty, damaged or incorrect items are replaced or refunded and we cover reasonable return postage. Refunds go back to your original payment method within 14 days of receiving the return.
Compatible with all PMAG accessories and Tactile Lock Plates.
Magpul makes it in the USA.
Polymer, according to Magpul.
Yes. It is ordered in from Magpul through our US supplier, not a copy or a clone.
It is ordered in from the manufacturer for you and sent by Royal Mail Tracked 24, with delivery in 7–10 business days and £5 tracked UK delivery.
7 to 10 business days from the date of your order. Every order is sent Royal Mail Tracked for a flat £5 and you receive tracking details by email when it is dispatched.
Yes. We list only genuine parts and optics from the brands shown, ordered in from the manufacturer for your order.
Compatibility notes on this page come from the manufacturer. If you are unsure, email us with your make and model before ordering and we will check rather than guess.
Yes. Bundle & Save applies automatically in your basket: 5% off when you buy 2 items, 10% off at 3 items and 15% off at 4 or more. It works across the whole range, so you can mix and match, and there is no code to enter.
Yes — you have 30 days from delivery to cancel for any reason, as long as the item is unused and in its original packaging. See our returns policy for the details.
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