looks to me to be armalite. If it looks like that one below, its armalite AR10 if it looks like this, its DPMS LR308 if you look at the back where the buffer tower is, you can see that its curved on DPMS style, and a straight angle on AR10 Overall though it mostly matters for barrel nut. Your BCG and barrel have to match - so you could use an LR308 barrel, so long as its with a LR308 BCG. the lower parts kits are virtually identical, there are only a few pieces that are even different for AR15s. Its more about what you want to use it for, and how deep your wallet goes :D