I have failure to eject malfunctions when mag is almost empty

[m1garand_man]

I have a MKII that I bought a few years ago and have had to tweak and replace parts on to get to run worth a damn. However I still have one issue that continues to persist. On occasion (used to be all the time) I will have a failure to eject. Initially I thought it was a weak or damaged extractor or a misaligned ejector. But with some tweaking cleaning and replacement of the extractor spring the problem mostly only happens in the last three rounds in a 32 round mag and only on certain mags sometimes. It doesn't seem like it should be a magazine related issue.

 

 

Has anyone else ever had this problem? What were you able to find out was the culprit?

 

[Guest title ii]

Can't say I've had these problems. John Andrewski recently did a complete build for me. He can most surly diagnose and fix the issues if your ready to go that route. I recommend him without reservations.

http://www.johnandrewski.com/

Good luck!

[m3bobby]

Does the extractor retain the case in the end of the bolt or does it drop into the body instead of ejecting?

[m1garand_man]

Does the extractor retain the case in the end of the bolt or does it drop into the body instead of ejecting?

Well it does when I manually put a case or dummy round on the bolt face with the bolt out of the gun. I haven't tried slow motion photography during firing to determine what happens then. My guess is that the case may be prematurely released from the bolt face on occasion. I have discovered that cleaning the extractor and extractor recess in the bolt seems to help. I have since replaced the original extractor spring with a NOS one out of the wrap when I compared the two the old one has indeed collapsed a bit. I have yet to test the new one though.

[wwiifirearms]

Start simple try:

1. Different ammo

2. Different mag

 

I've had rounds not eject when I tried weak frangible ammo. Also, the follower in the mag may make the last few rounds have a different attitude, perhaps dragging on the bolt and slowing it down. Just guesses.

[m1garand_man]

Start simple try:

1. Different ammo

2. Different mag

 

I've had rounds not eject when I tried weak frangible ammo. Also, the follower in the mag may make the last few rounds have a different attitude, perhaps dragging on the bolt and slowing it down. Just guesses.

Well I have noticed on some mags there is a decernable difference in the round angle on the first round in a fully loaded mag and when there is only one round in the mag using the round angle gage. I didn't think about that causing issues but it makes sense.

[timkel]

Sounds like you are well along troubleshooting your sten. As stated above, look at the Mag's. Compare the bullet angle with a gauge. Clean out the inside of the Mag's. Look for any corrosion. Check for any binding. Some dummy 9mm might be helpful. Edited November 7, 2013 by timkel