Here is the comment from the man himself.
"Martens813
Keep in mind the issue with the sand test was my fault and not a result of the design of the gun. I mixed and matched lowers and did not ensure that the retention pin fully seated in the lower. After the problem was found and the pin correctly seated, the receiveres did not seperate. Since this test, all of my uppers and lowers swap with no problems. Correctly seating the takedown pin is covered in the manual and I did not do my part as the user. The XCR is built like a tank and I trust it."
"Martens813
Keep in mind the issue with the sand test was my fault and not a result of the design of the gun. I mixed and matched lowers and did not ensure that the retention pin fully seated in the lower. After the problem was found and the pin correctly seated, the receiveres did not seperate. Since this test, all of my uppers and lowers swap with no problems. Correctly seating the takedown pin is covered in the manual and I did not do my part as the user. The XCR is built like a tank and I trust it."


















































