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Gunsmithing Aero Precision 556 M4E1 Lower

As Fisher mentioned, it will be helpful if you let us know what you have already tried, i.e. did you back out the buffer tube yet? That is what holds in the retaining pin. Backing it out a few threads should release it. If not, post a pic or two so we can see what's going on.
 
Hose it down with acetone, dry it, JB weld a piece of welding rod or drill bit to it and pull it out. If that doesn't work, 16 hits with the largest ball peen hammer you can find.

Your not a roughneck buy chance are you ? 🤣🤣

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