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  #61  
Old 15 January 2017, 20:56
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I just saw a post on another site about the Pmags, Website says Spring of 2017.....
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  #62  
Old 15 January 2017, 21:21
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I just saw a post on another site about the Pmags, Website says Spring of 2017.....
I pre ordered a few from Brownells. Also, D&H 300BLK magazines and Lancer 556 mags works.. too. Its the rib inside that offset the heavier bullets and makes them toe out..
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  #63  
Old 21 January 2017, 18:15
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OK, so I took this pistol to the range and despite some neglect, a little rust on the back of the bolt, this thing does not function properly. When I load a mag drop the bolt, it loads, when I rack the charging handle, it ejects, but when I fire it, no extraction and double feed. The main issue is no extraction. Any thoughts?
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  #64  
Old 21 January 2017, 18:45
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OK, so I took this pistol to the range and despite some neglect, a little rust on the back of the bolt, this thing does not function properly. When I load a mag drop the bolt, it loads, when I rack the charging handle, it ejects, but when I fire it, no extraction and double feed. The main issue is no extraction. Any thoughts?
Double feed is magazine, generally.
What grain bullet
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  #65  
Old 21 January 2017, 19:02
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Originally Posted by Steve40th View Post
Double feed is magazine, generally.
What grain bullet
With 300 BLK, there are some other concerns, such as:
-proper gas tube length for the load you are shooting
-proper buffer weight for the load you are shooting
-presence of an O-ring over the extractor with HD spring (sounds like the likely culprit in TFG's malf).
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  #66  
Old 21 January 2017, 19:07
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With 300 BLK, there are some other concerns, such as:
-proper gas tube length for the load you are shooting
-proper buffer weight for the load you are shooting
-presence of an O-ring over the extractor with HD spring (sounds like the likely culprit in TFG's malf).
Subsonic and H2 buffer, supersonic and carbine buffer are good.
Pistol gas for both above in SBR, pistol configuration.
O Ring? Hmmm
Thats as far as I can decipher.
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  #67  
Old 21 January 2017, 19:17
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Pull out the extractor, put a Crane O-ring around the spring, I prefer HD springs for 300 BLK. If the weapon is extracting fine, don't worry about the O-ring. If not, try the O-ring. Provides more positive purchase on the case.
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  #68  
Old 21 January 2017, 21:32
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Originally Posted by Steve40th View Post
Double feed is magazine, generally.
What grain bullet
120's. But the DF only happened occasionally. It was the fresh round jammed to the back of the unextracted casing.
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  #69  
Old 21 January 2017, 21:33
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Originally Posted by gavin View Post
Pull out the extractor, put a Crane O-ring around the spring, I prefer HD springs for 300 BLK. If the weapon is extracting fine, don't worry about the O-ring. If not, try the O-ring. Provides more positive purchase on the case.
So you are saying the spring (extractor) doesn't have enough ass to hold on during extraction?
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Old 21 January 2017, 22:49
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Originally Posted by The Fat Guy View Post
So you are saying the spring (extractor) doesn't have enough ass to hold on during extraction?
Yep. O-ring allows extractor to apply additional pressure thru leverage. Might not be the fix for what ails yer gat, but would be my next step in the diagnosis.
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  #71  
Old 22 January 2017, 05:49
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A failure to extract (as in the casing is still in the chamber) can be a couple of things. First and foremost one needs to look at the extractor spring/extractor. I prefer and use either the BCM enhanced spring or the springs from Sprinco.

If that doesn't solve the issue, then you need to look at the chamber. An incorrect chamber will cause this to happen. You can also have casings that are not sized properly.

The best way to troubleshoot this is to replace the cheapest item first- extractor spring and insert. I always tell people to make sure whatever ammo you are using has been fully vetted previously and avoid and reloads.

Test fire it again and see if the persists. If it does then you may have a chamber issue (out of spec).

Your malfunction is not a double feed. You have a failure to extract which leads to a failure to chamber. A double feed is when (2) live rounds attempt to enter the chamber at the same time.

Any idea who makes the barrel and other parts. My guess is that someone built that up, and if they used a 45.00 Anderson lower, they probably skimped on the other parts as well.
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Last edited by iraqgunz; 22 January 2017 at 05:55.
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  #72  
Old 22 January 2017, 10:13
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Quote:
Originally Posted by The Fat Guy View Post
OK, so I took this pistol to the range and despite some neglect, a little rust on the back of the bolt, this thing does not function properly. When I load a mag drop the bolt, it loads, when I rack the charging handle, it ejects, but when I fire it, no extraction and double feed. The main issue is no extraction. Any thoughts?
Maybe try a different BCG out of another weapon?
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  #73  
Old 22 January 2017, 10:29
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Quote:
Originally Posted by iraqgunz View Post
A failure to extract (as in the casing is still in the chamber) can be a couple of things. First and foremost one needs to look at the extractor spring/extractor. I prefer and use either the BCM enhanced spring or the springs from Sprinco.

If that doesn't solve the issue, then you need to look at the chamber. An incorrect chamber will cause this to happen. You can also have casings that are not sized properly.

The best way to troubleshoot this is to replace the cheapest item first- extractor spring and insert. I always tell people to make sure whatever ammo you are using has been fully vetted previously and avoid and reloads.

Test fire it again and see if the persists. If it does then you may have a chamber issue (out of spec).

Your malfunction is not a double feed. You have a failure to extract which leads to a failure to chamber. A double feed is when (2) live rounds attempt to enter the chamber at the same time.

Any idea who makes the barrel and other parts. My guess is that someone built that up, and if they used a 45.00 Anderson lower, they probably skimped on the other parts as well.

I have no doubt that most of the parts are from Anderson. The case comes out easily after dropping the mag and then closing the bolt on the unextracted case. It also cycles fine when done by hand.

Ammo is Remington factory 120 grn. I also need to do a very good cleaning of this gun as it appears to have "set" for a while.

I ordered a new spring and the O rings gavin mentioned. I will try the BCG from my 5.56 pistol. It is NP3'd and has never missed a beat in the other pistol.
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  #74  
Old 22 January 2017, 12:32
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Quote:
Originally Posted by The Fat Guy View Post
The case comes out easily after dropping the mag and then closing the bolt on the unextracted case. It also cycles fine when done by hand.
I defer to Gunz in this but it really sounds like the system is getting no gas when fired?
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  #75  
Old 22 January 2017, 14:22
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I've concluded that quality parts and proper specs are essential for reliable cycling with 300 BLK, much more than with 5.56, 7.62, 6.8, etc. As I type here often, match the gas system (to include suppressed vs unsupressed) and buffer weight to the load you are going to be using.

Think about the range of bullet weights available for 300 BLK, and then the available loadinga for other common MSR calibers. How many other calibers have commercial loadings with a range from sub-100 gr to in excess of 240 gr? I am pretty sure if you loaded 30 gr 5.56, and then 150 gr 5.56 (or any other big variation in weight), you'd see some finicky results, just like I see with 300 BLK.
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  #76  
Old 22 January 2017, 17:09
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The problem with hand cycling rounds, is that it does not replicate obturation that occurs when the weapon is fired, and the casing expands in the chamber.

In order to test the gas system, you need to take a magazine and load one live round and then fire. If it is working correctly, then it will fire, cycle through and finally eject. If it doesn't then you most likely have a gas problem.

Additionally depending on how they ported the barrel, not all .300 BO will cycle subsonic rounds without a suppressor in place so make sure you are using something lighter.

Quote:
Originally Posted by The Fat Guy View Post
I have no doubt that most of the parts are from Anderson. The case comes out easily after dropping the mag and then closing the bolt on the unextracted case. It also cycles fine when done by hand.

Ammo is Remington factory 120 grn. I also need to do a very good cleaning of this gun as it appears to have "set" for a while.

I ordered a new spring and the O rings gavin mentioned. I will try the BCG from my 5.56 pistol. It is NP3'd and has never missed a beat in the other pistol.
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  #77  
Old 22 January 2017, 17:49
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I must be one lucky schmo... the 10" .300 CMG barrel on a Colt A3 upper that I put together last summer seems to run quite reliably on either 120 or 220 grain bullets, with our without a suppressor. I've got a regular carbine buffer in my pistol lower.
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  #78  
Old 22 January 2017, 19:00
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Not really. Just measure the gas port, and that will tell you everything. If you make the port large enough, it will run anything. The problem is that when you juice it up from the get go, then adding a suppressor makes it super juiced.

Ultimately overgassing can cause premature parts wear, or malfunctions.

Here's an except from Noveske in regards to their 300 BO. I believe AAC follows the same formula.

Noveske’s 300 AAC BLACKOUT is designed to run optimally firing both subsonic suppressed and supersonic unsuppressed. This barrel is tuned to lock back on the last round using subsonic 220 and 208 grain ammunition with a sound suppressor. The firearm may not lock back with subsonic 220 and 208 grain ammunition without a sound suppressor. Also, the subsonic 300 BLK ammunition is more susceptible to a malfunction due to carbon fouling and adverse conditions than supersonic ammunition.

Quote:
Originally Posted by B 2/75 View Post
I must be one lucky schmo... the 10" .300 CMG barrel on a Colt A3 upper that I put together last summer seems to run quite reliably on either 120 or 220 grain bullets, with our without a suppressor. I've got a regular carbine buffer in my pistol lower.
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  #79  
Old 23 January 2017, 00:20
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I ended up building a 10.5" 5.56 AR pistol. Anderson lower, don't remember the upper, Brownells 1/7 barrel, Shockwave brace, tube and buffer, Bravo PNT trigger group, Troy VTAC Alpha rail. Can't wait to get it on the range.
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  #80  
Old 21 February 2017, 11:08
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Who are some quality manufacturers WRT 300 BLK uppers? I've got three Noveske's, trying to save money vice another one. S/F....Ken M
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