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I would just like to add that short of dremeling your way through that steel nut, there are other methods if, for some odd reason, you DO want to keep your plastic lower receiver or just want to know how to take it off without destroying the gun in the process.
I followed a few of the steps outlined above, namely the manual torquing, and heating up methods. Neither worked so I figured it might be loctite too, let it soak in solvents for a bit but that didn't work. As a last resort, I used some liquid wrench and put some on the edge of the threads; let it work its magic. After about 20 minutes, my brother and I took one wrench each, put one wrench on the steel nut and another wrench around the bronze buffer tube inner part, with a rag wrapped around it to protect from scratching it (I still managed to scratch mine a bit though, be warned). We torqued in opposite directions and the nut came off after a lot of elbow grease.
What probably happened is that the cheaper metal of the buffer tube and metal of the steel nut galvanized after they assembled the gun, liquid wrench is a good bet for anyone that wants to do this, plus you can just wipe it up if it hasn't worked; no damage or anything.
Hope that helps.
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