Beowolf versus 458 Socom??

[fanofflyn]

I know that the other parts in the lower receiver are the same as in my Rock River .223. I know that because, before I built the new lower, I used the one off the .223. There is a heavier mainspring and/or buffer that can be used, but I found either one caused short cycling, and that the standard parts work much better. I built separate lowers for all my uppers now because I like to make sure that they work well with that particular load, and because I like having the .458 ready where I can use it for a home defense weapon if that eventuality ever occurred.