I DO really want to post pics and the actual manufacturer name, but that's just the anger talking. I know I could clean this up with a jewelers file and emory cloth, but there is a high amount of principle at stake. You can see the wear is on the sides of the lug and the inside sides of the lower. You can see the impact spot on the inside-left of the lower. Any more force and I would be fearful I would mess it up permanently. This is the farthest I can close the rifle. I am about to spit nails! I sent 2 photos to them, and let them know that this is BS, and is the sort of thing I would expect when building a rifle from swap meet parts. Place it on your porch on Friday and UPS will pick it up." Their tech support told me, "We dont need the lower, just the upper. This will be ugly but will work fine & gun will shoot fine. Carefully file down sides of new upper rear lug so that it fits into old unused stripped lower. If that's right, sounds like the new upper rear lug is out of spec, & is too wide.ġ. Standard A2 upper rear lug fits into old unused stripped lower. New upper rear lug doesn't fit into different lower from same manufacturer.ģ. New upper rear lug doesn't fit into old unused stripped lower.Ģ. Your facts are hard to follow, but I think this is what you found:ġ. What would you do? (Sorry, no micrometers handy.) I dont want to be without my M4 for that long, or hold up a manufacturer that is building ARs for the general population. He sent them back to XCV, and their gunsmiths made it right. My father had this same issue with a lower and upper from the same manufacturer (But purchased at separate times). I then mated the naked lower onto a complete standard A2 upper. The upper lug did not fit down into the lower. I thought it might be the lower receiver being out of spec, so I tried to place the new M4 upper on a completed lower from the same manufacturer. They hinge together nicely, but the upper lug does not fit into the lower receiver. I placed the forward takedown pin to connect the upper and naked lower together. I bought an M4 kit from the same company. I would rate finishing one of these receivers on a mill as well within the capabilities of any hobbyist with basic machine skills.So, I have had a lower in the safe for about 10 years from a major AR manufacturer (Lets call them XCV). I milled in a little more clearance and the problem was solved. One error I made was not cutting the rear channel deep enough into the buffer tube threads, and when I checked the fit of an upper receiver the takedown pin wouldn't quite line up. Inside dimensions of the pocket are not super critical, and a few thousandths error probably won't be noticed. Once the holes were done, it was simply a matter of milling out the receiver pocket with a long 7/16" end mill and finally cutting the slot for the trigger with a long 5/16" end mill. The holes for the selector (3/8") and trigger and hammer pins (5/32") were drilled first and they must be precisely positioned for proper function of the fire control group. AR-15 lower receiver blueprints are readily available online, and my main concern was calculating the dimensions from the drawings correctly. Still, there is that satisfaction of building your own.įinishing one of these receivers on my Grizzly Mill/Drill was not a big chore. In fact, a gun assembled from individually purchased parts may cost you more than a factory-built firearm. Over the years, I have built several 1911 pistols for my personal use. It's going one step further than simply assembling a rifle kit from finished parts. It's the sense of accomplishment more than anything else. I think most people tackle a project like this because they like making their own stuff. They currently sell the 80 percent lowers for $155 and CNC-finished lowers for $165, so cost isn't a factor. The beautiful billet lowers in the pictures came from Juggernaut Tactical. You can finish it for your personal use as long as you may legally own a firearm but you can't sell it unless you're a licensed manufacturer.įinishing a lower requires a milling machine or drill press, a fixture if you choose the drill press method, some drills and end mills and very basic machine skills. To the Feds it is a chunk of aluminum and can be purchased online without an FFL. An 80 percent receiver is simply one that is not finished enough to be considered a firearm by the ATF.
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