Upper Receiver Spec Question. StepUp/Lip From M4 FeedRamp>M4BarrelRamp W/in Spec?
Upper receiver M4 Feedramps appear to be either too low or too deep. This causes a lip instead of a smooth transition to the M4 ramp of the barrel.
I am sure it is the upper receiver and not the barrel as I have put this barrel into two other receivers and those had visually zero step/transition lip. I have also put an FN made barrel into this receiver with the same exact bump/step up / lip from the receiver to the barrel.
Is this within spec? The receiver mfg says it is within their spec and they do this so people can "fit" the barrel to the receiver. Which I take to mean "file the barrel ramps to smooth the transition". Is that right?
Pic below:
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