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
07/02 NFA Dealer

http://www.blackhammerarms.com
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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
07/02 NFA Dealer

http://www.blackhammerarms.com
http://www.facebook.com/blackhammerarms
https://www.instagram.com/blackhammerarms

[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
07/02 NFA Dealer

http://www.blackhammerarms.com
http://www.facebook.com/blackhammerarms
https://www.instagram.com/blackhammerarms

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
07/02 NFA Dealer

http://www.blackhammerarms.com
http://www.facebook.com/blackhammerarms
https://www.instagram.com/blackhammerarms

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


BLACK HAMMER ARMS
07/02 NFA Dealer

http://www.blackhammerarms.com
http://www.facebook.com/blackhammerarms
https://www.instagram.com/blackhammerarms

[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.