FWIW, i have the same calipers, and I noticed when the battery was almost, dead it started to do that. Once i replaced it with a fresh battery, the problem went away. Not sure if that was the cause, but it seemed to work for me.
Hello, After some time (mostly to see how things play out) I'm posting my experience with 21sportstactical. Apologies in advance for the wall-o-text.
on 12/28/2018, I placed two different orders:
1. PF940V2 kit with coupon codes that gave me a discount & LPK. Putting the total cost to $105.00...
His rear rails did look a little high, we didn't have calipers on site to measure. Also his slide is a bit more tighter on tolerances than my Swenson one is. But I have over 3k rounds through mine. Also I believe the connector isn't being pushed far enough by his slide causing light primer...
I was just at AGC with another member yesterday and I asked that exact question. The RSOs there said no problem to DDs such as larger caliber rifles, they would likely assign you to the end rows of the range to minimize disturbance to the other shooters.
I'm not sure about Serbu, but they did for the Safety Harbor AR-15 .50 BMG upper. I believe Safety Harbor is fighting this.
https://modernrifleman.net/2018/08/08/atf-decides-a-50-bmg-ar-15-upper-is-a-firearm/
I'm up in Columbia with a working PF940V2, I'd be happy to come take a look at it. I can bring my slide as well and test fit it on yours. PM me if you want to meet up?