If you have to take a hammer to it or file the shit out of it to make it fit.It's not right. Not sure why everyone thinks this is a "feature" to make it tighter when there are prints for tolerances that work fine and are tight. This could be the result of one of two things The fire control group pocket is located slightly forward of where it should be as they are a different operation from the pins OR the radius is too big as I stated earlier. Looks to me like the upper lug is hitting the radius in the corner. I don't think an AR will ever be made someone can not find something about it to complain about. When it means removing the finish to fit the lower to an upper I can not see how that would be intended. Never saw anyone advertise them as being made that way for a "custom fit". They was to much variation between them with some fitting, some being able to be worked in with slight grooves having to be scratched into the lower, and some had to be filed to fit. A couple of Stags I got a few years after that had a visibly different machine cut and a looser fit, although still snug.ĪGP Arms went through a similar transition, they originally offered a tight fitting lower, but changed to a looser fit for their parts lowers due to complaints.Ī month from now someone else will be complaining in a thread about how their upper is wobbly. The Stags I got in late 2004 were very tight, and comparable to RRAs. 05 seconds it would have taken their CNC to mill an extra 5 or 10 thousands of aluminum was skipped for some cost saving measure? Good grief.ĭue to all the complaining from home rifle assemblers/parts buyers, Stag changed their machining to a looser fit. I do believe it saved them some machining steps when they made the lower. I don't believe it was made that way for a reason. Here's a tacked almost 7 year old thread about it in the troubleshooting forum. I will mic the lug and inside width of the lower at work tomorrow. NOTE: This isn't meant to be a "guess the manufacturer" thread. I'll keep yall updated on if this "tier 1" manufacturer is able to $$ themselves and make a rifle close the whole way. The next thing you know, I'll be hacksawing the lower into tiny pieces and posting pics. 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. So, I have had a lower in the safe for about 10 years from a major AR manufacturer (Lets call them XCV).
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