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Discussion Starter · #1 ·
Hi,

I have here an MR223 that hasn't been used in about 2 years - not fired, lubed or cycled.

When I try to cycle the bolt the BCG gets stuck halway into the buffer tube. Until that point, the spring pushes it back forward as usual, but beyond that it gets stuck. I can pull it all the way back, but then I have to hit the back of the stock hard for the BCG to jump forward.

What could be the problem? When it was last used there was no problem.

Could there be oil/grease in the buffertube that binds?

I admit, I haven't taken the spring out yet - just wanted to ask first to be sure.

I'd welcome any tips.

Thank you.
 

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Check to see if the metal bridge in your lower is blocking rearward movement of your hammer. I had this problem and had to remove the bridge. But since you have a mr556 it should come from factory with bridge installed. Maybe dried up hardened lube?
 

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Check your buffer as well. I had mine disintegrate on an MR556 and the debris may be responsible for preventing the bcg from retracting into the buffer tube.
 

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Discussion Starter · #5 ·
Thank you for your answers.

I fixed it. The bridge really was the problem. The BCG got stuck on the hammer because the hammer didn't move down far enough. No idea why...

But I also checked the butter tube, spring and buffer.

All your help is very much appreciated!:love:
 
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