I had a long action BLR some years back and if there was any aluminum in that firearm that would have surprised me. I sold it not too long after only cause of the "weight", too heavy. Aside of that issue I know of two similiar problems happening to two .308 BLR's here in my parts. Both rifles experienced a "stripped" gear. Whether it was the factory grease that never got cleaned out and used in cold weather or it was metal fatigued, I do not know. They both are not and have never use reloaded ammo either, just factory ammo. Because of that I might reconsider. I have used alot of Browning arms and still do but something about that particular problem is queersome. Just my .02 --- by the way Browning did honor to repair the problems.