Matching upper/lower billet machined to fit together

[Ligito]

I saw this on an AR manufacturers website.

Matching upper/lower billet machined to fit together.


If it is made to Mil-Spec tolerances, it should always fit, right?

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[Cameron72]

If it's just mil-spec the upper and lower receivers may rattle and clunk. Billet receivers should fit tight.

 

[2Wheels4Ever]

An acu wedge does wonders in getting rid of the wiggle. Most of the colts used in the military all had a lot of wiggle. Makes them feel cheep in hand, but it does not really affect anything but long range accuracy.