Will an ar lower for 5.56 work with 300 blackout?

Alfonzo Connelly asked a question: Will an ar lower for 5.56 work with 300 blackout?
Asked By: Alfonzo Connelly
Date created: Tue, May 25, 2021 2:43 AM

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Those who are looking for an answer to the question «Will an ar lower for 5.56 work with 300 blackout?» often ask the following questions:

🔬 Will standard ar mags work with 300 blackout use?

Forgive me if this is a stupid question, but I've been looking for somewhere to verify that my thinking is correct in that I don't need a special BCG/bolt setup or magazines to use 300 Blackout in a standard AR upper. All standard 5.56 parts except for the barrel. So, yes, 5.56 bolt, 5.56 mags. first post nail's it.

🔬 Will any ar 15 lower fit a 300 blackout?

Q: "Can I install a 300 blackout upper on an AR-15 lower?" A: Yes. In fact, buying a pre-built 300 BLK upper and installing it on your AR-15's existing lower is the easiest way to get into shooting this unique round.

🔬 What ar uppers will work with 5.56 lower?

Although the upper and lower dimensional specs are the same for all AR-15s, there are different types and weights of buffers used depending on barrel length (and possibly other factors). My question is: Do I need to change buffers and/or springs when I switch from a .300 BLK with a 16" barrel to 5.56 with a 20" barrel?

10 other answers

5.56 will not chamber in .300 BLK. Most .300 BLK will not chamber in 5.56 without significant bullet setback. Even if you could get 5.56 into a .300 BLK chamber it wouldn't be particularly dangerous. .300 BLK in a 5.56 chamber will frag the gun.

Yes you can drop your .300 upper right onto a .556 lower-depending on sub or super-you will need to change buffer weight. Mags are the same-the "dedicated .300"mags have a front rib that has been trimmed/molded down so long rounds won't nosedive on feed ramp.I've found Daniels mags don't have the rib.

Because it was designed to work with the standard AR lower you can simply just throw on the 5.56 upper when it’s time. Then, when the 300 Blackout is called back into the game just swap it back. For the gun enthusiast, the 300 Blackout is a powerful tool and there is no reason not to have it in your belt.

Yes. 2. level 1. tklite. · 1m. Most lowers that work with 556 will also work with 300 Blackout with just an upper swap. 1. View Entire Discussion (2 Comments) 397.

But can you fire .300 Blackout cartridges in AR-15 magazines built for other rounds? If you have a magazine that is built to take on 5.56 NATO rounds, then the answer is yes. However, it probably won’t be compatible if you have a magazine that typically chambers .223 rounds.

A 300 blk upper will work fine on a 5.56 lower. Push out pins, install new upper. Best if you have a complete upper with BCG. Good idea on mags, have a system to keep ammo separate. I use black P mags in 300 blk, and any other mag is a 5.56. Posted: 11/9/2015 3:31:29 AM EDT.

A .223 or 5.56 round will cycle into a 300 BLK barrel, and possibly the reverse is true. This means you have to practice proper ammo management. At no time can you risk mixing up or mixing together your mags or your ammo.

Hence, it doesn’t matter if it’s a 5.56, .223, or a .300 Blackout, this lower receiver would pretty much fit any rifle among the AR category. Many users really loved the overall built quality of the receiver and the looks of the classic standard stock, hence they bought a few for the other AR rifles in their arsenal.

The barrel and length of the gas system are the only things exclusive to 300 Blackout. All other AR-15 parts are compatible with this round. If you wanted to, you could simply swap the barrel and gas system length on an existing gun chambered in 5.56 or .223.

As has been said, you can absolutely load, chamber and fire a 300BO round into your 5.56 gun accidentally. It will result in a ruined firearm, and maybe a kaboom, esp if there's a second shot. If you do use your 300BO mags for your 5.56 gun, and also have some loaded with 300BO ammo, I suggest doing something to give yourself a visual differentiator.

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