Yeah...Mine wasn't tapped, but it had been drilled out. The hole mic'd out larger than it should have been for 6-32. Serial Number on mine is 57. They also had the first batch waaaay tight on the tolerances, so hopefully you won't run into too many of those issues. It didn't wind up being too big of a deal...just had to get a longer set screw and thread the hole a little deeper. Seeing as no LPK's come with two of those pins, I would think the lower receiver SHOULD come with one. I didn't pick mine up straight from JD, and would have never figured out what their plan was without calling Rob about it. Oh well, she's all patched up and functions just fine now. <thumbsup> Still looking for free time to get the upper assembled...maybe this weekend if the wife lets me have a break. I've only had two days I didn't work so far this month...and this weekend she has plans for me to start tearing apart a bathroom :o