03-29-2011, 05:06 PM
That is the same lug that broken on the 3 bolts I had. After having the front face of the receivers were trued up, I haven't had any more broken bolts. Keep in mind that even with the AR15 in 5.56mm, it is recommended that the bolts be replaced every so often. With the thinner metal around the base of the Grendel/7.62x39 cartridge family, it only stands to reason that those bolts would benefit from replacement more frequently.
