I just took the ban Era recoil check off of the barrel of my newly acquired AR10A2 about two months ago.It had a blind pin on the bottom you could see with the naked eye,welded over and ground to match the contour of the recoil check.I ground down through it with a Dremel and split the entire device lengthwise on both sides,just barely to the threads.Then split it in half with a cold chisel, chased the threads with a die,and installed an A2 flash suppressor as God intended.