#Thermold subsonic 223 full
This improves reliability and also helps allow you to fit the full number of rounds intended to fit in a given mag. The internal geometry was changed and designed specifically to help heavier grain 300 BLK subsonic ammo (200gr +) stack properly. So what changes were made to help them better accommodate 300 Blackout? Like the 5.56 L5AWM mags, the 300 BLK versions offer the same ultra-durable polymer construction and steel feed lips. Lancer's L5AWM has been our choice for the best 5.56 AR-15 magazine in recent years, so we were thrilled when they launched a 300 Blackout line at 2018 shot show. Here are our choices for the best 300 Blackout magazine options, specially designed for this cartridge: 1) Lancer L5AWM 300 BLK Magazines While you probably already know this, a great gun safety rule is to always designate and mark magazines specifically for 300 BLK to avoid accidentally loading them into the wrong rifle. It should go without saying, but to be clear, never use 300 BLK in a rifle chambered in another caliber like 5.56 as this can lead to catastrophic failure. This is particularly true when using subsonic ammunition that is slightly longer and heavier, as these rounds tend to have more problems in 5.56 mags. You can use your 5.56 AR-15 magazines with 300 Blackout ammunition in a rifle chambered in 300 BLK, but magazines designed specifically for 300 Blackout can improve performance and cut down on common reliability issues. Can't I Just Use My 556 Magazine with 300 Blackout?
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