What is the problem w my .300 blackout w suppressor.?

[trophyhunt]

Not super excited about this, have an upper .300 black that I put on my AR frame, .223/5.56.  Shot it w my suppressor and stuff just is not working.  A little research says maybe try a different spring, or put on an adjustable gas block.  Look at these picks and tell me what you think?  Shot w hot ammo and sub sonic, same issue.

[trophyhunt]

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[trophyhunt]

It’s damaging the tips of my ammo and the next round gets pinched and jammed.

[OltHunter]

Those are some wild pics! Not sure I've seen that before.

Do you have the standard buffer weight in the lower? I would start there and go to a H2 to see if anything changes. Adjustable gas blocks or more of a pain in my experience than worth it.

Seems likes the ejection process is moving too fast but don't think it would cause all that yellow blow back crud. Not really sure what's up with that.

[trophyhunt]

Yeah, in my research I agree w you, h2 spring will be first!

[Sneaky]

suppressed guns run filthy - especially gas guns. going to have to clean way more than normal. The malfunctions are more what I would be worried about and yeah different spring/buffer weight combinations are the right place to start. Can also try a different BCG if you  have multiple rifles to borrow parts from.

Is the yellow stuff brass? does it do that with multiple brands of ammo? The photo looks like hornady subx?

[trophyhunt]

I believe it’s brass, not 100%, and yes that is a hornady sub. Slight scratches on the brass, but not too much. 

[birdshooter1189]

I'm pretty sure the yellow stuff is either powder residue, or inert filler material from in the case.  When loading certain loads with certain powders, there is excessive open volume in the case which can lead to inconsistent burn rates and other issues.  This issue is particularly prominent when loading reduced (subsonic) loads. One way to mitigate that issue is to add inert material on top of powder to fill the case volume.  Being that it's a 300 blackout running suppressed and you have used subsonic ammo....i'm guessing that's inert case-filling material.  Without a suppressor most of it would blow out the end of the barrel. But with a suppressor more of it is being directed back into the action.

The damaged cartriges could be a byproduct of the gun not cycling properly because it is so dirty. Before you change springs or components, cleaning/lubricating/switching ammo may solve your problem.

To confirm if there is filler material in the case, you can shake the case by your ear and see if you hear the powder moving. If there is filler it is probably a compressed load and you won't hear anything.  If there is not filler, 50% chance you will hear powder movement because it still could be a compressed load, depending on powder used. 

Absolute way to confirm if there is filler: pull a bullet apart and see what's inside. If it is all uniform powder, then the yellow residue is unburnt powder.  If there are two distinct and separate powders in the case. One is filler and one is powder.  If you reload and have a bullet puller, use that. In the absense of a bullet puller you can use pliers or vicegrips to pry and twist and rip the bullet out. Wear safety glasses and be careful to not hit the primer and be careful not to spill and mess.

Experimenting with different brands/loads of ammo should allow you to find one that runs cleaner in your gun.  But it is a general rule that when using a suppressor you will just have to accept the gun running dirtier and needing cleaning more often.

[Ridgeratt]

We used to use corn meal in reduced loads for a filler, sometimes you would see kernels like that.

[dreadi]

It's not brass. All that yellow stuff is unburnt powder. And all of that is normal when anyone is using those Hornady subs.


BLACK HAMMER ARMS
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[trophyhunt]

Great input, appreciate it.

[dreadi]

Q: Are you using standard AR carbine parts?

I run 220gr subs loaded with IMR 4227 in a 8" AR machinegun that is suppressed. It's built with standard AR carbine parts with a M16 carrier. However, I have not tried those Sub X rounds in it. I might try and see if they work in my standard parts AR but, my Hornady Sub X rounds were purposed for bolt action.

You may be experiencing rounds that are not loaded powerful enough to cycle your actions.


BLACK HAMMER ARMS
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[trophyhunt]

Q: Are you using standard AR carbine parts?

I run 220gr subs loaded with IMR 4227 in a 8" AR machinegun that is suppressed. It's built with standard AR carbine parts with a M16 carrier. However, I have not tried those Sub X rounds in it. I might try and see if they work in my standard parts AR but, my Hornady Sub X rounds were purposed for bolt action.

You may be experiencing rounds that are not loaded powerful enough to cycle your actions.


BLACK HAMMER ARMS
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I'm not educated enough with guns to know what you mean by carbine or not.  I had a new .300 black out complete upper and installed it on my AR15 platform that had a 16'' barrel, my 300 black is 10.5 ''.  You are correct that it's not cycling enough, catches the next bullet half way through loading and pinches it.  I'm gonna clean the living crap out of it this weekend and take the suppressor off, then fire hot rounds to verify that works, then the sub rounds and see after it's clean the results.  I will order the H2 spring if I can ever find a damn link to it. 

[dreadi]

Q: Are you using standard AR carbine parts?

I run 220gr subs loaded with IMR 4227 in a 8" AR machinegun that is suppressed. It's built with standard AR carbine parts with a M16 carrier. However, I have not tried those Sub X rounds in it. I might try and see if they work in my standard parts AR but, my Hornady Sub X rounds were purposed for bolt action.

You may be experiencing rounds that are not loaded powerful enough to cycle your actions.


BLACK HAMMER ARMS
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I'm not educated enough with guns to know what you mean by carbine or not.  I had a new .300 black out complete upper and installed it on my AR15 platform that had a 16'' barrel, my 300 black is 10.5 ''.  You are correct that it's not cycling enough, catches the next bullet half way through loading and pinches it.  I'm gonna clean the living crap out of it this weekend and take the suppressor off, then fire hot rounds to verify that works, then the sub rounds and see after it's clean the results.  I will order the H2 spring if I can ever find a damn link to it.

Springs and buffers come in different lengths and weights.

https://www.brownells.com/gun-parts/rifle-parts/rifle-recoil-parts/ar-15-carbine-buffer-spring/

https://www.brownells.com/gun-parts/rifle-parts/rifle-recoil-parts/ar-15-carbine-buffer-ed549572/

H2 is a reference to weight in a buffer. If your bolt is not being pushed back far enough, typically you would not go up in weight from a carbine buffer weight to an H2.

A H2 buffer is about 4.6oz
A Carbine buffer is about 3oz


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[b23]

It’s damaging the tips of my ammo and the next round gets pinched and jammed.

Since this is a conversion I'm guessing you're using 223/.556 magazines and not 300BLK specific magazines, yes? 

There isn't a whole lot of difference between the two mags but there is a difference and where the difference shows up is when you're shooting the longer heavier sub ammo.  It's not a lot but the front edge of the mags on 300 BLK specific magazines is slightly thinner which allows for a little more room with those heavier longer bullets to start moving forward and get angled up a tiny bit more then a 223/.556 magazine allows.  It's not a lot but it's just enough to generally prevent the tip from smashing into the front of the magazine.  When shooting lighter bullets in 300 BO's the 223/.556 magazines usually work fine but when guys are having issues, like you are, and you want to shoot the heavier Sub ammo it's often solved by using 300 BO specific mags.

As for the yellow specks you're seeing sprinkled all over the chamber area of your rifle it's just stuff they put in the powder and is a non issue.  It's most likely a lot more noticeable when you are shooting with the can screwed on the end then it will be with no can.

First thing I'd do is go buy a actual 300 BO magazine and see if that solves your problem.  It may not help and you could have other issues going on but if you're currently using regular 223/.556 magazines your problem very well could be cured with something as simple as using the 300 BO specific mags.  It'd be worth buying one and giving it a go.  That's the first thing I'd try.

[fly-by]

 catches the next bullet half way through loading and pinches it. 
[/quote]

This sounds like a failure to feed and may be attributable to the shape of the Hornady subs vs your feed ramps.  Before buying a bunch of parts, try some 220 grain FMJ subs and see if these feed.  If they do but you are getting failure to eject, overgassing, or other issues, then buy an adjustable gas block, springs, buffers, etc.

I shoot a lot of suppressed sub and supersonic 300 BLK. They sell it as a round with the ability to shoot super and subs interchangeably.  In reality you need to do some load development to find 2 rounds that a given gun will run reliably with a simple mag swap.  Mine is 220 grain FMJ with 11.0 grains of 1680 for subs, and 125 grain TNT and 19.0 grains of 'Lil Gun for supers.

[trophyhunt]

Thank you, will do.  I’ll have to get a 10 round one thanks to this commie state, ordered an h2 to check that box. 

[10mmg]

Both my 300 ar will not reliably cycle the 208 hornady black ammo but will cycle the 190 grain. They love the remington 220 subs. one is a home build the other is a daniel defense.

[trophyhunt]

Here are my hornadys and the other brand I haven’t shot yet.

[dreadi]

Thank you, will do.  I’ll have to get a 10 round one thanks to this commie state, ordered an h2 to check that box.

Why did you order an H2?


BLACK HAMMER ARMS
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[dreadi]

Adjustable gas blocks don't allow more gas to pass than a standard gas block.


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[trophyhunt]

Thank you, will do.  I’ll have to get a 10 round one thanks to this commie state, ordered an h2 to check that box.

Why did you order an H2?


BLACK HAMMER ARMS
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well, I’ve had a few people tell me that might fix it?  It was only $37 on midway so I figure it’s worth a shot?  I’m not a gun guy so this all sucks, was hoping to slap it all together with the can and go.  Nobody told me I might have issues, lol. 

[trophyhunt]

I didn’t buy an adjustable gas block, sounds like those are a pain

[dreadi]

Thank you, will do.  I’ll have to get a 10 round one thanks to this commie state, ordered an h2 to check that box.

Why did you order an H2?


BLACK HAMMER ARMS
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well, I’ve had a few people tell me that might fix it?  It was only $37 on midway so I figure it’s worth a shot?  I’m not a gun guy so this all sucks, was hoping to slap it all together with the can and go.  Nobody told me I might have issues, lol.

If an H2 gets you closer to operational, you have an even heavier buffer than an H2. Did you see the weight references  I posted earlier?


BLACK HAMMER ARMS
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[trophyhunt]

I haven’t pulled my spring out yet, but it seems my action is too fast?  Kinda wish I could just drop off the damn thing to someone to fix but not sure about laws anymore, can’t keep up with the BS that gets passed.

[fly-by]

Adjustable gas blocks don't allow more gas to pass than a standard gas block.


BLACK HAMMER ARMS
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They do if you open up the gas port.

[dreadi]

Adjustable gas blocks don't allow more gas to pass than a standard gas block.


BLACK HAMMER ARMS
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They do if you open up the gas port.

Which adjustable gas blocks allow more gas to pass through than standard gas blocks?


BLACK HAMMER ARMS
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[Alchase]

Adjustable gas blocks don't allow more gas to pass than a standard gas block.


BLACK HAMMER ARMS
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They do if you open up the gas port.

Which adjustable gas blocks allow more gas to pass through than standard gas blocks?


BLACK HAMMER ARMS
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None!

You are correct!
Adjustable gas blocks only adjust one way, a standard gas block in already by default wide open.

[trophyhunt]

Cleaned, and installed my h2 buffer, didn’t even eject the spent shell and in one shot, smashed the spent shell.  Going for an H3 next with the advise of a gun guy at Big J’s in orting.  Frustrating but he thinks the h3 will be it. 

[dreadi]

Cleaned, and installed my h2 buffer, didn’t even eject the spent shell and in one shot, smashed the spent shell.  Going for an H3 next with the advise of a gun guy at Big J’s in orting.  Frustrating but he thinks the h3 will be it.

So your bolt carrier group didn't move enough to eject the case and crushed it. Using a heavier buffer isn't going to remedy that.


BLACK HAMMER ARMS
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[swanderek]

I  went through this was psa.
Probably an undersized gas port or rough chamber causing issues.
Buffer isn’t gonna help with that

[trophyhunt]

Well crap, guess I’ll have extra buffers laying around, already ordered it.  The gun guy said it was ejecting too fast, but not knowing these types of guns at all I went with his idea.  With my standard buffer, it was ejecting but smashing the new round in half. 

[OltHunter]

Yeah, H2 not ejecting is showing not enough gas or too heavy buffer! But carbine buffer was showing too much gas or not enough buffer. Maybe we misinterpreted your first issue as too much gas and cycling too fast as not enough gas. Maybe without the gas it wasn't clearing all that yellow junk out and the tips were getting smashed cause it wasn't cycling back quite enough.

You do have a weird, non standard issue though unfortunately. Cans usually are adding more gas and pressure so you need to up your cycling weights.

I wasn't right with my first assessment. But I do agree that a H3 wouldn't help if H2 didn't help. It would fix the crushing cause I think a H3 would put it to a single shot!

I'm also leaning toward a gas issue. It shouldn't be that hard to fix issues with subs and a can, the fact that is has for you means something more involved or harder to fix is going on.

[trophyhunt]

Great, I should have mentioned the last time I shot it, I took the can off.  Maybe my next step should be an adjustable gas block?  And the next after that….throw it in the ocean!!

[elkrack]

Great, I should have mentioned the last time I shot it, I took the can off.  Maybe my next step should be an adjustable gas block?  And the next after that….throw it in the ocean!!

I think you should go with that latter so we all can get a good chuckle

[dreadi]

I've read this thread a few times to make sure i had not missed anything before commenting again.

It's appears to me that you have not determined what some of the parts are that you are working with. We don't know what buffer weight or buffer spring you started with. Those are some key components that need be known before throwing money at the problem.

Have you determined if the gas block you have is correctly installed?  If the gas block is not installed correctly, you could be experiencing a reduction in gas flow.

This is far fetched...do you have the correct gas tube installed?

I saw it mentioned and it's worth checking the gas port on the barrel and see if it's in spec. It's also worth checking that your chamber is in spec as previously mentioned.

If you have all standard carbine spec parts and all parts are in spec, then your firearm is most likely not compatible with those Hornady Sub X rounds


BLACK HAMMER ARMS
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[trophyhunt]

Because of laws, well, the upper was purchased complete and I’m not sure what exactly each part is.  I’ll tear it down and see if I can get better info.   It was supposed to be all aero precision, but it isn’t stamped on the barrel anywhere. 

[trophyhunt]

Took the current gas block off and ordered an adjustable one off midway.  Had drill the old one out cause one set screw was so tight and stripped. 

[Duckslayer89]

Great, I should have mentioned the last time I shot it, I took the can off.  Maybe my next step should be an adjustable gas block?  And the next after that….throw it in the ocean!!

Throw it in the ocean and buy an AK. Problem solved.

[trophyhunt]

Update, had a good friend stop by and look at my gun.  Turns out my brand new barrel is a POS, two different carriers wouldn’t match up smoothly with the barrel.  Buying a better brand and hopefully it’s good to go!

[swanderek]

What brand was it?

[trophyhunt]

It’s not stamped or identified anywhere??  I’m gonna call the place where I bought it today and see what they say, just gonna buy a known brand and replace it.