I use this..
http://www.midwayusa.com/product/262..._vc=OBv1262861
In my experience, usually the screw threads strip before the ones in the receiver. But then it's still necessary to clean out/ re-thread the receiver mounting hole threads. I've done several using this tap. In fact, my son's brand new Model 16 that I bought for him recently had holes that were so dirty and full of burrs that they were essentially unusable. Like you, I thought about marching back to the gun shop where I bought it, and the possibility of sending it back. But instead I spent about 10 minutes with the tap, and carefully cleaned up all four holes, and it worked great. I'm not real jazzed about having to do that on a brand new gun, but honestly, to me it's a better option than sending it back and waiting for them to do the same thing. Only problem is, if you mess it up, it's now your problem, not theirs. I don't think they'd do much to help in that case. But if you go slow, use plenty of lube, and back it out frequently and use air to blow out the debris, you shouldn't have any problems. Just don't force it or start it crooked.
Also, I've heard of something called a "thread chaser", that I think is more suited to this purpose because I've heard that it doesn't remove as much material..? I don't know if this is fact or fiction, but I've not been able to find one. I'm sure someone here will chime in. But I do know that the bottom tap will work.
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