Brand new AR-15 pistol not ejecting live rounds when I manually use the charging handle to do so - Page 1

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[ARCHIVED THREAD] - Brand new AR-15 pistol not ejecting live rounds when I manually use the charging handle to do so

Posted: 1/7/2023 2:19:15 PM EDT

Hello I just bought a FP8.5-300HBAR-7RPR-SBA3 which is a Radical Firearms AR pistol chambered in 300 blackout. When I load a live round and then try to manually eject it with the charging handle it’s like the bcg will not grab the round to eject…? The side of the lower where it says caliber, next to it says “MULTI”. When I try the same thing with a 55.6 everything functions properly. But this is supposed to be chambered in 300 Blackout? Any solutions?

Posted: 1/7/2023 2:46:44 PM EDT

[#1]

Are you chambering the round slowly or are you letting the bolt slam home? Basically what you’re looking for is the bolt pushing into the round hard enough to ensure the round is fully seated into the bolt and the extractor is around the rim to be able to extract the round.

Posted: 1/7/2023 2:47:28 PM EDT

[#2]

Whats the barrel stamped? The lower means nothing.

Second, why are you fiddling with live ammo? Safer to use shells or snap caps.

Are you riding the chsrging handle home, or letting it slam under its own power?

Posted: 1/7/2023 3:00:43 PM EDT

[#3]

Yep, to charge the rig, pull the Charging handle all the way back, and let it go.

The bolt has to close with round being pushed forward with enough speed/force, that it snaps the extractor over the rim, then spins the bolt lugs to lock them in play.

Hence to see if the bolt is correctly locked up to start with, look at the front edge of the carrier of the B/C, and make sure it tight against the back face of the barrel extension. If you walk the Charging handle forward to load a round, bolt will not lock up correctly/extractor will not be over case rim to lock onto it, and your going to have a gap between the carrier/back of barrel telling you the problem.

Also, confirm that when you pull the charging handle all the way back, front face of bolt lugs are about 1/8"~1/4" in front of back edge of ejection port with handle pulled all the way back. If bolt is coming farther back than this, then wrong length buffer tube in play, as well as same for bolt not coming back far enough, which could be either buffer, recoil spring, or receiver extension not deep enough..

Posted: 1/7/2023 4:01:02 PM EDT

[#4]

Yes it is slamming home. I’ll let it slam home and pull the CH back several times and it still won’t grab the round. But I can put 5.56 in it and it will eject them every single time. It’s like I ordered a 300 blackout but they sent me a 5.56

Posted: 1/7/2023 4:12:51 PM EDT

[#5]

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Quoted:
Yes it is slamming home. I’ll let it slam home and pull the CH back several times and it still won’t grab the round. But I can put 5.56 in it and it will eject them every single time. It’s like I ordered a 300 blackout but they sent me a 5.56

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As suggested above see what your barrel is stamped.

Posted: 1/7/2023 4:51:16 PM EDT

[#6]

It says 300 BLK 1/8

Posted: 1/7/2023 5:01:19 PM EDT

[#7]

Does the 300 round fall back out of the chamber or do you have to punch/pry/etc the round back out?

Posted: 1/7/2023 5:07:18 PM EDT

[#8]

Ok, hold on.

Must be an issue with the chamber. The BCG is fine, same for the two different rounds.

There’s something wrong with the chamber.

You can get tools to ream the chamber, but screw that, send it back, let them put a new barrel in for you.

Posted: 1/7/2023 5:08:20 PM EDT

[#9]

No I have to stick a cleaning rod down the muzzle and pop it out. I have to hit a few times for it to come loose and fall out.

Posted: 1/7/2023 5:09:32 PM EDT

[#10]

Bham AR

That’s what I’m thinking. It’s literally brand new!

Posted: 1/7/2023 5:53:19 PM EDT

[#11]

Quote History

Quoted:
No I have to stick a cleaning rod down the muzzle and pop it out. I have to hit a few times for it to come loose and fall out.

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Well, something is wrong with the chamber. Contact Radical

Posted: 1/7/2023 5:58:07 PM EDT

[#12]

Since anything can happen like a mislabeled barrel look at your muzzle and tell me if it appears to be .22 or .30.

Posted: 1/7/2023 6:27:36 PM EDT

[#13]

Does it work correctly when you are shooting it?

Posted: 1/7/2023 6:54:28 PM EDT

[#14]

Thank you guys for all the help. I’ve contacted Radical and waiting on a reply. I’m just going to send it back.

Posted: 1/7/2023 11:57:37 PM EDT

[#15]

It wouldn’t surprise me in the least to see Radical put out a .300 Barrel with a 5.56 chamber. That would explain the BO not chambering while the 5.56 does so with no problem. You should not be able to chamber a .223/5.56 in a .300 BO chamber but you can, in some cases, chamber a .300 BO in. 5.56 chamber, not always, but it can happen. But you should never be able to chamber a 5.56 in a BO chamber.

Posted: 1/8/2023 11:55:57 AM EDT

[#16]

Do not attempt to shoot that upper until you get this sorted out!

Posted: 1/8/2023 11:35:01 PM EDT

[#17]

That’s what I was thinking as well. And yeah I’m not going to shoot it. I’m calling them tomorrow and figuring it all out. Thanks guys

Posted: 1/9/2023 1:36:06 AM EDT

[#18]

What sized drill bit fits down the bore from the muzzle end?

Posted: 1/11/2023 12:58:04 PM EDT

[#19]

So I called radical and they told me that in some cases with a brand new rifle that you may need to clean the chamber with the specific caliber wire brush and make sure it is oiled up really good and then go to the range and shoot the rifle and it should eject no problem. I guess we will see

Posted: 1/11/2023 1:48:36 PM EDT

[#20]

Good luck. Wear eyepro.

Posted: 1/12/2023 6:14:35 PM EDT

[#21]

Quote History

Quoted:
So I called radical and they told me that in some cases with a brand new rifle that you may need to clean the chamber with the specific caliber wire brush and make sure it is oiled up really good and then go to the range and shoot the rifle and it should eject no problem. I guess we will see

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Did you tell them the rifle will chamber a 5.56 round without any problem? SOMEONE correct me if I'm wrong, but it is my understanding that you should NEVER be able to chamber a 5.56 round in the .300 BO chamber, case head to shoulder length is too long for the bolt to lock up with the 5.56 round in then .300 BO chamber. And if his rifle IS chambering the 5.56 and the bolt is locking up, something is terribly wrong.

If what I said above is correct and from my internet searches it is, I don't give two craps what Radical said, DO NOT SHOOT a .300 BO in that rifle. If it has a .308 groove barrel but with a 5.56 chamber, it probably will not KB if you manage to cram it in there but it may well make you soil your pants. THINK TWICE about proceeding. If you are determined to keep that barrel, have a COMPETENT smith check it out to see what chamber is actually in the barrel, not just what it has stamped on it.

Posted: 1/12/2023 6:23:36 PM EDT

[#22]

Quote History

Quoted:
if his rifle IS chambering the 5.56 and the bolt is locking up, something is terribly wrong.

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Quote History

Quoted:
if his rifle IS chambering the 5.56 and the bolt is locking up, something is terribly wrong.

This.

It really sounds like something is really messed up. A 5.56 should not readily chamber in a 300 barrel, nor the inverse (although 300 will generally chamber with enough force due to bullet setback).

As a completely random guess, maybe they chambered a 30 caliber blank with a 5.56 reamer. That would be how to make a barrel that will easily chamber both cartridges as well as allowing the 300 to drop too far into the chamber.

If what I said above is correct and from my internet searches it is, I don't give two craps what Radical said, DO NOT SHOOT a .300 BO in that rifle.

I would advise in the strongest possible terms to not attempt to shoot anything in that firearm. I would stop attempting to chamber live rounds also to preclude any possibility of discharging a live round.

Posted: 1/12/2023 7:47:20 PM EDT

[#23]

You can get a 5.56NATO into a 300 BO chamber without any issues and it will lock up. The shoulder dimensions on a 5.56 is .3594 and 300 blk shoulders at .368, thus, it will slip right past. The shoulder distance of the 5.56 is roughly where the 300 blk would hit the throat of the chamber so it will hit and provide resistance for the extractor.

I'm not saying it's a good chamber. I'm just saying pay attention if you own both and that yes, you can get 5.56 into 300 without much notice.