And if so what kind.
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And if so what kind.
......
My friend had issues with the O-ring. It caused the extractor to have too much tension and it wasn't ejecting the brass after being fired. He took the O-ring off and hasn't had an issue.
I wonder if to much tension would keep the round from feeding by preventing the round from locking into the bolt head before the round chambers.
Since you are talking about this in another thread I would have just kept this post there. Why don't you explain exactly what type of upper you are using now, barrel length, etc...so we can get a better picture of what's happening. To be honest I am confused after reading your initial post.
It is entirely possible that the extractor could be so tight as to not grab the rim of the cartridge as it should. I would remove it and then test fire the weapon.
Usually if it's going to cause problems it'll be failure to feeds. The rounds will make it most of the way to the chamber but the bolt won't lock. If using a 5 coil extractor spring, black extractor buffer and a O-ring you should be sure that the ejector and spring and buffer spring are up to the task. This is one of the reasons why I replace buffer springs when they get down to 10 1/4" instead of waiting until they are right at the bottom edge of the spec at 10 1/16". I use Brownells standard rate chrome silicone springs which start out at 10 1/2" when new. Also be sure to keep the ejector lubed up and make sure it's moving freely. Too much extractor tension can over power the ejector and you'll get poor or no ejection.
On the rifle no and no
On the BCM assembled upper yes and yes.
Today I'm going to place my BCM upper that has last had feeding issues on my another rifle lower I will test fire to see if I have failures to feed. If I have failures I will than remove my O ring and retest.
Let me make this clear I no way suspect the problem to be with BCM or DD
I would remove the O-ring from the start because in your situation it really isn't needed. Also, your posts can be somewhat confusing. Are you saying that you have a Daniel Defense upper on a Colt barrel? The last I knew ( I could be wrong) Daniel Defense uppers were all M4 style. If you are having problems with all of those types of ammo there is definitely something not right.
Yeah that was my post.
I had experienced a major failure with my LMT which resulted from the use of an O ring. The weapon is an LMT 14.5" which started life as a 16" and was professionally chopped by Steve at ADCO to 14.5" and a Smith Vortex was perm attached. I was using an O-ring along with the correct black extractor insert and correct extractor spring and an "H" buffer.
There was WAY too much extractor tension which was causing the extractor to shave small amounts of brass from the case rim. This brass was accumulating on the bolt face, and eventually a small piece got "sucked up" into the ejector tunnel causing the ejector to "freeze" in the tunnel. This obivously caused FTE malfunctions as the spent round would be stuck on the bolt face and thereby cause a nasty double feed every time it would strip a new round from the magazine. This problem happened when running PRVI M855.
I have since removed the O ring and no longer run them as a matter of "default" on an M4 unless the weapon demonstrates the symptoms of weak extraction.
DD makes a upper without feed ramps and that is the one I have. This is not a feed ramp issue.
I removed my BCM upper with its Colt BCG that was having feeding issues from my Colt lower and left the Oring insert in place. I than placed my BCM/Colt BCG upper on another lower and test fired.
200 rounds of brown bear in one hour and the rifle ran perfect.
I am confident the the O ring is NOT the cause of my feeding issues.
I just wanted to run a separate thread to address the possibility of O ring issues for I could not fathom that a defective fire control group may by causing feeding issues.