Is this normal? Stripped lower.

It is the clearance for the forward assist which is quite normal in some brands of lowers.

Its not counter bored as much as more material is removed for clearance. A number of brands do this.

Which brands do this? I'm not being snarky, I really want to know.

I've got a few Colt Canada and Colt USA lowers, as well as a PWS lower so I'm going to check it out when I get home.
 
Checked my Colt Canada. It appears perfectly symmetrical. Measuring is a little difficult because it does taper as you move to the top of the receiver. My feeble attempts to measure were around 5.11mm and 5.12mm when trying to measure across the same spot.
 
Face palm yourself. If purposely done that way, than the business that put their name on it can explain why. And don't say clearance because M16 been out since the 50s and nobody had issues with tapping that FA.

I don't think the FA was available until 64, but why not try and modify the design, there's not a whole lot you can change on a lower other than cosmetics and ambi controls, If it was put there by design good for them. If not oh well, I didn't expect much from these lowers at 65$, but from what I've seen/recieved They are worth the 65$, if it was a Blem one I guess, I didn't actually see it mentioned in here rereading it.
 
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Ahh - when I saw "stripped lower", I thought the reference was to the counterboring of the buffer tube threads...
 
This is the best pic I could take. It is symmetrical as far as I can ascertain.


Your point? Is it forged or billet? Brand?

As I mentioned already not all are this way but some other billet brands are. No big deal.

Its for clearance to eliminate the FA pinch point. Personally I do not like this practice but I will not slam a site sponsor and their product for choosing to fabricate this way. Once the rifle is assembled nobody would even know unless a slick side was used.
 
There is no need for the clearance. The FA is well above and forward of the RE tower. This is very odd.

A few brands that manufacture "billet" receivers have a pronounced ring with sharp edges so the FA side is machined back to eliminate the PINCH POINT or bite that may happen when panic pushing is used.
 
Being as the tube well isn't a rounded one, more "octagonal" for lack of a better word, it makes sense to have the FA side reduced. Looking at the photos of mine, it is right inline with the FA.
 
Your point? Is it forged or billet? Brand?

As I mentioned already not all are this way but some other billet brands are. No big deal.

Its for clearance to eliminate the FA pinch point. Personally I do not like this practice but I will not slam a site sponsor and their product for choosing to fabricate this way. Once the rifle is assembled nobody would even know unless a slick side was used.

Gear down big rig. I was posting as a point of reference. THAT'S MY POINT. If you read my post above the picture post, you would see I mentions "Colt Canada".
 
Face palm yourself. If purposely done that way, than the business that put their name on it can explain why. And don't say clearance because M16 been out since the 50s and nobody had issues with tapping that FA.

Sorry the f:P: is not for you personally as much as this concern is unwarranted for the $64 price we paid.
 
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