I love using a table because it shows the connection between bullet velocity and bore pressure. What’s The Bullet Velocity of AR-15 Barrels? My favorite feature for the PDX is the SCW stock because of the customization and an incredibly low-profile feel. There are ways that some companies, like Maxim Defense, can help mitigate the felt-recoil to allow for more shot-to-shot accuracy. A shorter barrel can have a helluva kick if shooting something as powerful as a 5.56mm or 7.62mm bullet. Understanding the bore pressure inside each AR barrel length will also help you get an idea of the felt- recoil you can expect.
This is because the bullet has more time in the barrel to balance the pressure. A 20" barrel has almost less than 5X the pressure of a 5.5" barrel. When you choose an AR platform, knowing the PSI is a helpful way to understand how high the pressure in your barrel is. They measure bore pressure in Pounds Per Square Inch (PSI) because it’s the easiest and most effective way to measure the pressure coming out of a barrel. My point is a 5.5" barrel might be for you, but it might not be if you’re not using it for CQB purposes. However, I wouldn’t want to shoot at 500 yards with it versus an AR with a 20" barrel. The PDX is absolutely perfect for close-quarters combat (CQB), such as urban fighting or a home invasion.
300 BLK bullet.Ī gun like the Maxim Defense PDX is only 18.75" and can be chambered in the same caliber as any other AR at twice the PDX’s overall length. I’ve always stated my home-defense gun is a Mossberg 12 gauge loaded with 00 Buckshot, but the PDX offers more maneuverability than my Mossberg 500 and the power of 5.56mm, 7.62mm x 39mm, or a. Right behind the difference in weight is the maneuverability that a 5.5" barrel provides, that physics won’t allow for in a 16" barrel. Why Would I Need A Shorter Barrel on My AR-15?Īnytime I hold an SBR or AR-pistol platform, the weight difference in a “chad" AR with a 16" barrel is incredible.
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