300 will reach is around $0.50 per round. 300 Blackout is more expensive than 5.56. It also tends to be more affordable, often costing around $0.30 per round (not during a global pandemic and gun buying rush).300 Blackout is growing in popularity and is pretty easy to find on the shelves. Cost and Availabilityĥ.56 is extremely popular and widely available. Even with the use of a suppressor, shooting 5.56 still requires the use of hearing protection. If you want to run 5.56 through a shorter barrel, you need to be prepared for increased muzzle flash and increased noise. 5.56 was designed to be used with longer barrels, and reaches optimal performance through a 20” barrel. The ability to use subsonic ammunition, along with a suppressor can give you an extremely quiet firearm. 300 Blackout was designed specifically to be used with a shorter barrel and a suppressor, and can reach optimal performance through a 9” barrel.300 Blackout is also capable of cycling supersonic and subsonic ammunition, without the need to additional modification. Having less recoil will allow for the ability to get more shots on target in less time. Recoil also means muzzle rise and the need for readjustment. 300 blackout round does have slightly more recoil, though it is still fairly low. If you want to do more distance shooting, 5.56 is the better option. 300 Blackout due to its increased velocity. 300 Blackout has an effective range of about 300 yards, while 5.56 has an effective range of about 500 yards. 5.56 was designed to fragment upon penetration. The increased speed of a lighter bullet takes less time to reduce which diminishes its ability to penetrate as many surfaces. 5.56 rounds use lighter bullets that typically range from 40 grain to 77 grain. The increased bullet weight means that it will move slower, but it will not slow down as quickly once fired, allowing for a greater penetration of surfaces. 300 Blackout rounds use heavier bullets that typically range from 110 grain to 220 grain. 300 Blackout or 5.56 can be simplified by viewing each through a few different lenses. The barrel is the only part that is different to accommodate the different bullet sizes. 300 Blackout mostly use the same parts, with the exception being the barrel. Once you have decided to build an 80% lower, your next big decision is which caliber you want your new AR15 to shoot.
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