Thanks!There will be no hole for MCR upper 2nd take down pins and here's why:
1) It's not needed at all with our lower. We tightened up tolerances to eliminate wobble. This makes the 2nd pin a useless part. Don't worry, it's super easy to remove the pin.
2) With the Lynx 180B there's no stock adapters for different style stocks like there is on the WK180C, Nodak Spud, and WS-MCR. Instead the entire rear of the receiver can be swapped out. This allows us to have a shorter and lighter receiver compared to any others. This also means the MCR rear take down pin doesn't align with anything well and would require us to add extra material for it to work.
3) If we were to support the MCR's pin we would need to move the entire stock down which would ruin the cheek weld. This is because on the AR carbine stock the pin would hit the buffer tube threads, on the 1913 stock the pin would hit the rail, and with the Zhukov stock the pin would hit the stock shank pocket.
4) It's easier to field strip without the pin.
5) Our upper receiver will not have one.