Quoted: Muad_Dib,
When you say that you replaced the spring with a HD with black insert, please humor me; what is that & do they have a site?
Thanks
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HBAR16 hit it on the head in his above post. I should have written
Heavy
Duty but got sloppy, sorry. I actually bought mine from a member here who was buying them in bulk from SAW. They aren't easy to come by. I even called Colt and they didn't have any available. They gave me about three places to call that might have had them, none did.
Here is a basic explanation of what happen. With the 14.5" barrel, the gas pressure is stronger. It pushes the bolt back fast enough so that when it unlocks, the centrifigal force of it spinning causes the extractor to open up slightly. There are actually plans to change the bolt design to eliminate this problem. When it opens up, it lets go of the case, and the case is not ejected properly and often remains jammed between the bolt and the locking lugs.
Now this can be "fixed" in multiple ways.
1.Colt (and other spring manufacturers) makes a heavy duty spring. It's a slightly different color, sometimes it looks copper colored. Colt also has a heavy duty insert that goes inside the spring. In the standard M16/AR15 the insert is blue. The heavy duty insert is black and noticeably harder. This extra spring pressure keeps the extractor in place, counteracting that problematic centrifigal force. They're about $5 each, give or take.
2.You can purchase a D-Fender ring that goes around the spring underneath the extractor. It's basically a wedge shaped piece of rubber. This essentially increases the pressure under the extractor just like a heavy spring, maybe even more pressure. Cost, about $15.
3.You can go to your local hardware stor and purchase a small polymer O-ring. I don't remember the inside/outside diameters, but it's easy enough to take your spring with you and make sure that the O-ring will just fit around the spring. This acts exactly like a D-Fender but isn't a "specialty" item. Cost is about 12cents each.
I actually used both 1 and 3. As long as I used the HD spring and insert, there was no noticable difference in the way the case is ejected with or without the rubber O-ring. But for 12 cents it was cheap insurance.
Hope that helps.