Failure To Eject?
I am getting lots of FTEs (the empty doesn't eject and the next round tries to chamber) with a certain bolt carrier group and am trying to figure out the cause.
Here are the parts:
Daniel Defense 14.5" lightweight barrel cut down to 10" by ADCO
Nodak Spud slick side upper (the BCG seems like it fits a little tighter than normal)
Yankee Hill Machine slick side chrome plated M16 BCG (blue extractor plunger)
55 grain .223 (works in other rifles)
standard carbine buffer and spring
The rifle cycles fine when I use a Spike's Tactical M16 BCG and ejects to about the 2:00. The mags I used work in my other rifles. I was getting malfunctions almost every round.
Any idea what is causing this?
Do you have a good gas seal?
Most often a double feed is a failure to fully eject.
I edited my post to show that the fired round isn't ejecting fully. There isn't any escaped gas around the FSB and it works fine with another BCG.
check your gas rings
Gas rings are fine.
are there any markings on the rim of the casing that failed to eject?
I didn't notice anything unusual.
ok, did you check the extractor face? Maybe the spring is bad?
You can switch the bolt from the spikes BCG into the bolt carrier that giving you problems. See what happens… if it is related to the bolt or the tighter fitting carrier
Good idea. Next time I'll try that.
If your spent casing and a live round are jamming into the chamber at the same time, I had this same problem. My spent rounds were pulled from the chamber, but were not ejected from the rifle. The spent round was jammed into the chamber with the new live round in what looked like a double feed, but it wasnt. Got an extractor spring upgrade kit from Bravo company and havent had a problem since. Its a new heavy duty spring, a black silicone insert and an O-ring that go under the extractor claw in your bolt. $5 easy fix, +$10 of bullshit shipping charges if i remember correctly. It fixed my problem. Good luck op
Pull the bolt, and via a spent case off the extractor, cam the ejector in and out to confirm that it's not binding in the bolt face channel.
Next, pull the extractor off, go to the hardware store, buy a #60 O ring, install it around the extractor spring to add more tension, then put the rifle back together.
Pull all the way back on the charging handle and look at the face of the bolt to confirm that it's not retracting back past the back edge of the ejection port window (Bolt face should stop about 1/4" to 3/8" in front of the back of port window edge).
Now go to the range, load a single round into a mag, insert and charge that round will leaving the empty mag in the rifle, and fire for effect (correct effect is the bolt catch catches the bolt to lock it back via the bolt face, and not the catch only catching the bottom of the carrier.
+1 on the #60 o-ring along with all the above. If it's not stovepiping my guess is the extractor tension. If the o-ring fixes it then either get the upgrade kit or change out the o-ring every 1000 rounds. Pack of 10 is $2 at home depot.
It seems like you have 2 BCG's to play with, take the spikes bolt and put it in the other carrier. This may show the offending part.