The arguments for .308 Winchester over 5.56 NATO are well known and far spread through many internet forums. Undoubtedly many of you realize the advantages in firepower of the .308. We know of the incredible amount of reloading data, DOPE, and other consumer information available from the .308 community. This information will help you find a load that meets your needs or give you a great starting point to load your own high quality ammunition. If you have decided to invest in a weapon chambered in .308 Winchester chances are you have seen rifles being referred to as AR-10 or LR-308. I hope that this article can help you better understand what those designations mean and more importantly the components of these weapons systems.
AR-10 Versus LR-308
The purpose of this article is to lay out the advantages and disadvantages of the AR-10/LR-308 weapons platform. I will begin by giving a brief background that many of you are undoubtedly familiar with. The AR-10 is the predecessor of the AR-15. Eugene Stoner’s original design was built around the .308 cartridge, but the military asked for a scaled-down model based on the .222 Remington cartridge which at the time was one of the go-to cartridges for accuracy. This request led to the 5.56 NATO cartridge and the AR-15 we know and love today. Technically anytime the terminology AR-10 is used it should refer to Eugene Stoner’s original design which is now produced by Armalite. There are many other manufacturers who produce their own version of the AR-10 these rifles should be referred to as LR-308.
No Milspec for LR-308
The AR-15 has been mass-produced to exact specifications because of its use in the military. Unfortunately, things are not so cut and dry for it’s older brother, the AR-10. Gun owners and manufactures alike have realized the advantages of the weapons platform. This has led to many different versions based on the AR-10 not all of which are compatible. There are various companies such as SIG-Sauer, Palmetto State Armory, Aero Precision, DPMS and many others that produce their own LR-308 rifles. What adds to the confusion further is the fact that these rifles do not share compatibility with each other. Unlike the AR-15 platform where you can take parts from various rifles and combine them without issue, at least in theory. This is due to the fact that there is no mil spec as previously mentioned.
DPMS or Armalite
Although there is not a standard set of specifications there are two frontrunners as far as design and specifications are considered. These are the AR-10 produced by Armalite and the LR-308 produced by DPMS. The two platforms are often referred to simply as AR-10 style or DPMS Style, many but not all AR-10/LR-308 rifles follow one of these patterns. However, there are many others that are completely proprietary. This complicates assembling your own rifle beyond the lego-like assembly of an AR-15. One must do their research and really know what parts they are trying to put together and what platform they are designed for.Continue reading“Why I Chose a .308 Winchester AR – Part 1, by Dusty”