I have an AMD 65 that I assembled years ago. Has about 500 rounds through it. I just replaced the wire stock with one with a cheek piece and noticed a crack across the rear of the rear trunion. It running from top left corner of the stock mortis to the left edge. I can't see it on the inside to see if it goes all the way through. Anybody seen this with a AMD 65? Do i need to replace the trunion? Seems to function fine just don't want to have a trunion failure and a face full of recoil spring. Sorry the picture is so dark.