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There are several manufacturers of 308 caliber AR-family rifles now. Most of them will interchange with one system or another, but it can be tough to keep track of which one is which. While many components are the same, for instance, your 308 standard lower parts kits, the design of DPMS style upper and lower can vary greatly. Previously, I had described the differences in 308 DPMS styles, however let's address major manufacturers compatibility.Moriarti Armaments - your true DPMS 308 l... Read more

Still, the biggest question that I get, is what type of receiver one has. Let's look at the differences between DPMS style 308 uppers.One simple very generic distinction is that the older, "high profile," upper will have the forward assist all the way at the end. The new, "low profile," resembles an AR-15 slicker design, the forward will be somewhat towards the middle.The older, "high profile" design will remind you of the bulkier, rectangular build vs. the low profile is slicker, thinner and sm... Read more