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Post by mtbugle on Nov 23, 2012 13:27:32 GMT -8
So I have been working with the 300 BLK a little now. BHW barrel. It shoots supersonic well and Subs group good. But The factory subs are ejecting almost all the time now (11 of 12 times) but not feeding next round. So I am still a little under gassed. The barrel port is out to .120 now. It seems the boards show .110 being sufficient to get working. I did notice a little mis match in the gas tube hole and hole in gas block. I might attempto to egg out tube hole a little to insure not restricting any there. Other than that what are my options. I have A2 stock and I believe mil std spring and bolt for A2 stock. Will I need to trim a coil or two off spring? Or is there possibly some thing I have missed. I think I have studied up on this pretty well, but there always seems to be some thing else to be learned.
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Post by GLSHOOTER on Nov 23, 2012 15:17:26 GMT -8
So I have been working with the 300 BLK a little now. BHW barrel. It shoots supersonic well and Subs group good. But The factory subs are ejecting almost all the time now (11 of 12 times) but not feeding next round. So I am still a little under gassed. The barrel port is out to .120 now. It seems the boards show .110 being sufficient to get working. I did notice a little mis match in the gas tube hole and hole in gas block. I might attempto to egg out tube hole a little to insure not restricting any there. Other than that what are my options. I have A2 stock and I believe mil std spring and bolt for A2 stock. Will I need to trim a coil or two off spring? Or is there possibly some thing I have missed. I think I have studied up on this pretty well, but there always seems to be some thing else to be learned. I don't have a BLK but my guess would be That the ammo is just not hot enough to get it done. I would try another brand of ammo first. This is where the adjustable gas block would come in if you were to open it up. If you open it up more to get 100% reliability without an AG then you may well be way over-gassed for the supersonic stuff. Greg |
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Post by gunmutt on Nov 23, 2012 16:06:47 GMT -8
I don't own a Blackout yet but have done alot of research. The carbine gas seems to be to long of a system to reliably function with this round in sub mode. Are you running a suppressor? If so that should give you the pressure needed to run subs. If not then why run subs? Just run the heavier round with closer to the maximum amount of powder to get the system to function. Subsonic is only worth using when a suppressor is used
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Post by Brandon Sneed on Nov 23, 2012 20:46:19 GMT -8
In the bhw barrels, and running carbine gas, you'll either need to remove one weight from your buffer (spacer maybe) and have your gas port set at .125".
This setting works with Remington subs and hornady subs, unsuppressed. Edit: hornady 208g whisper ammo uses a different powder than Remington and cycles perfectly (in my gun) without the weight and are more accurate than Remington's.
Run an adj gas block as well to help with any overgas with suppressed. The overgas unsuppressed with supersonic ammo was negligible and ejected around 6-10 ft depending on the loads around 2-3:00. Food for thought.
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zj762
Junior Member
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Post by zj762 on Dec 9, 2012 12:53:33 GMT -8
I don't have a blackout, but I do have a 7.62x40. I was having the same issue. A2 stock also. The A2 buffer is to heavy for the blackout. With my x40, I switched my stock to a collapsible and used the standard carbine buffer. Also, the Noveske kx-3 "flaming pig" flash suppressor, if you would call it an f.s. helped a lot with getting it reliable w/ the faster burning powders, h-110 in particular. Just my .02 cents. Hope it helps.
-Zach
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Post by mtbugle on Dec 9, 2012 19:49:18 GMT -8
Thanks all for the input. I tried removing 2 of heavier weights in buffer and put a rubber hose spacer in to keep stuff from moving too far. That lower weight of buffer from about 5.4 ounces to just over 4. still no feed. today I took all weight out of buffer and trimmed some misalignment of gas tube to help with gasflow. I hope when I next try, it will work. Has anyone got the A2 system to work or does every one go to carbine.
Thanks Don.
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Post by Brandon Sneed on Dec 9, 2012 19:58:19 GMT -8
Thanks all for the input. I tried removing 2 of heavier weights in buffer and put a rubber hose spacer in to keep stuff from moving too far. That lower weight of buffer from about 5.4 ounces to just over 4. still no feed. today I took all weight out of buffer and trimmed some misalignment of gas tube to help with gasflow. I hope when I next try, it will work. Has anyone got the A2 system to work or does every one go to carbine. Thanks Don. If you want to discuss this feel free to Pm me and we can discuss it via phone. I'm not sure now what you have set up. For carbine gas: Gas port drilled out to greater than 0.092" up to 0.125" with the gas tube aligned straight. Using an A2 stock/extension you'll need a lighter weight buffer (car) and a spring with tension equal to a carbine spring but in the A2 extension. |
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zj762
Junior Member
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Post by zj762 on Dec 10, 2012 5:25:20 GMT -8
Don't quote me on this, but I believe a standard carbine buffer weighs in at 3oz. I've never seen any blackout w/ an A2 buffer system personally. Can you give us a run down on wut you're using parts wise? Is your bcg a standard ar-15 or an m-16 carrier? Are you running a suppressor? Wut loads are you running? If your running hand loads, wut powders are you using? It sounds like your gun isn't holding the pressures up long enough 2 cycle. It's a common problem w/ the "short" 30's. A lot of the powders used in them have a very fast burn rate. This works well for blow back operated systems cuz the the fast burn rate/pressure makes the force enough to cycle it(bullet weight plays a part in this as well) but...when you start using a gas operated system, the fast pressure spike just doesn't hold long enough to travel down the barrel, thru the gb, and then back thru the gas tube n cycle the action. This causes quite a predicament for us who like these cartridges. This is also why people are starting to run pistol-length systems on their blackouts w/ adjustable gb's. These calibers will run and run well, just gotta give them a lil extra tlc.  If ya keep having problems, pm me and I'll help you out. -Zach |
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Post by sarusan68 on Sept 2, 2013 16:08:01 GMT -8
Don,
I had a similar issue with my 300 BLK, found that the gas block was not properly aligned with the port on the barrel (1/3 was blocked) and found that the 300 BLK is very sensitive to having proper amount of gas to cycle.
Once I corrected this, my 300 has eats everything I feed it without an issue (excluding a batch of commercial reloaded ammo that was too short and had case neck issues).
My set up is using a 16" BHW carbine length barrel, BCM low profile gas block, Young Mfg National Match Lite BCG and H buffer (2.9 oz). Occasionally I run one of my FailZero M16 Full Auto BCG's and have no issues with that either.
Contrary to advice from my gunsmith, I decided to use lighter weight components in my AR to reduce mass since 300 BLK's produce less gas pressure than a 556 round (some basic physics) and so far it has worked well.
Since I am not doing full auto rapid firing, I am not concerned with high cyclic rates or the potential damage that could occur to my receivers (which are forged) because of the low recoil impulse from the 300 BLK.
In case you are wondering, I have left the gas port on my BHW barrel unmodified from what ever size it came when I ordered it earlier this year.
Mike
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If ya keep having problems, pm me and I'll help you out. 