|01-15-2006, 06:05 PM||#1|
Join Date: Feb 2004
Location: New Albany, IN
Fail to feed problem
I ran into a problem at the range that I wanted to share…
I took my 6 mil Rock-Ola “mix-master” to the range for an ops check after replacing the bolt, stock, and trigger housing with “correct” parts. I immediately had failure to feed problems. The cartridge would jam with the nose in the chamber and the rim under the front of the bolt face. Slight pull back and release of the slide and the cartridge would jump into the chamber…hmmm. Since I had never had any problems with this rifle, I knew I had introduced it with one of the parts. Also, I had just grabbed some mags out of the drawer and was not sure I had personally ops checked any of them. Short shooting session with the Carbine, glad I had brought the M1s with lots of ammo!
Once home in the shop, I took a closer look at the problem. From what I could see the cartridges were hanging up on the bolt??? Removed the Rock-Ola bolt and compared it to the Underwood bolt that was initially in the rifle. I could not see any dimensionally differences between the two. Installed the Underwood bolt…rifle functioned fine??? Removed the Underwood bolt and did a second closer comparison of the two. The only difference that I could see was the ejector on the Rock-Ola bolt was protruding slightly beyond the rim around the bolt face…the ejector on the Underwood bolt was slightly recessed.
Disassembled the Rock-Ola bolt and grabbed my spare ejector from the parts box…compared the two ejectors and the one in the Rock-Ola bolt was definitely longer than my spare. Installed the spare ejector in the bolt and it did not protrude beyond the rim. Installed the Rock-Ola bolt into the rifle and it ops checked good.
Sort of reminded me of what a good friend told me several years ago...”if it ain’t broke, don’t fix it!”
|01-15-2006, 06:29 PM||#2|
Join Date: Oct 2004
If it happens with more than one mag, its probably a worn mag catch. They allow the mag to sit a bit too low and the result is much as you describe. The other tendency is for the loaded round to stovepipe. If you have a spare mag catch, try that and see if it solves the problem.
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