jtallen83

Not having an ex I may be behind the curve here, why would one keep those?

M14 mag? Armalite used to sell a kit that retrofitted M14 mags to work in the AR-10.

That's the Shiit right there!

That may end up being the solution but lets take a close look first. If something is hanging up like that there should be some marks somewhere, inside the upper, on the lower where the buffer tube threads inside, on the BCG? Take some pics and post up if you see anything.

Been looking hard at that scope for my 338 federal build, what do you think of it?

I call her Bench Pig, she's busting 16 lbs as she sits here. Particulars,

This retainer and the Tubbs carrier weight are solutions, can't find the Tubbs anymore though. https://gallowayprecision.com/offset-buffer-retainer-for-AR-15-rifles

That looks like a pretty good solution. Not knowing a machinist that won't charge me it is cheaper to buy the offset retainer for me.

That looks delicious!

I'll recommend Joe Bobs but they are all on backorder there right now. Brownell's is as reliable as you get, if they are out keep watching, they restock regular.

I can't imagine the transport in a package having more violent movement that what it goes through when firing, highly doubt what you are seeing there happened during shipping. If it shoots shoot it, if it isn't reliable then schit can it and get a Toolcraft, basic and they work. Throw that Lantac up for sale here, I'd risk it for the right price.

Welcome from Iowa!

8.5 pounds without optics and magazine.

Very nice looking rifle!

Can you see inside the firing pin channel? Could be bad machining in there causing the issue. If you cant see then a thin wire rubbed along the sides might tell you if it is smooth in there.