Ruined 80 lower?

[MegademiC]

Yeah, it looks like there are a few chatter marks that could indicate a loose mill nut.
Sorry it didn’t turn out so well. Brownells has 80% lowers reasonably priced if you want to try again.

I just looked- why are andersone 80% $10 more than complete lowers? - rhetorical question

Well it’s not ruined, but i would limit it to a range gun. The area you milled to deeply does add much if any strength to the grip screw area. There is nothing it a lower that is high pressure or abused by the operating system.

Could always look into one of those shotgun stocks on it. I assume they wouldput less stress there. Or just start over and cut your loss.

[Diamondback]

I'm not an expert, but if I'd done that I'd probably blue-stripe it and restrict as a Range/Training/Competition gun. IF my understanding is correct based on my old engineering classes, all the real load is in the upper and the buffer tower/tube anyway.

[JeepHeep]

Thank you all for the info it has really helped. I may just put it together until another 80 comes in and then probably swap a few pieces over. Lesson learned.. check to make sure my endmill isn't walking away on me

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[Renegade]

nah, JB weld to fill it in, or get someone to tig weld it.

[Diamondback]

Yeah, recheck and if need be tighten up the chucks on your tooling is VERY important, too. My first plastic EPL, when I was drilling pilot holes for the FCG pocket, I put the tip of my 3/32" drill bit through the sidewall in a non-Load Bearing area... that lower's been sprayed orange and set aside for a .22LR upper.

But hey, I successfully completed an AR lower using only a cordless drill, so there's that!

[rpoL98]

nah, JB weld to fill it in, or get someone to tig weld it.

or JB Weld a piece of aluminum plate into the bottom to build up the thickness somewhat. Should be okay, remember, they make AR lower receivers out of polymer nowadays also.

[SteveS]

Put the lower together and see if it works. In todays pc world you effed up I said it sorry if it hurts your feeling. That being said if you never try things you will never eff up. Try doing another lower and go even slower.