(Continued from Part 1. This concludes the article.)
Handguard and Barrel Nut
The final parts of the upper include the barrel nut and handguard. The barrel nut is used to secure your barrel to the upper and is generally included as part of your handguard. There are some handguards that don’t supply a barrel nut so you will want to check for that when purchasing your specific handguard. You will also want to match your handguard, gas tube, and barrel to make sure they all match. Standard barrel lengths are 16, 18 or 20 inches. There are various gas tube lengths such as pistol, carbine, mid-length and rifle. I won’t go over the specifics of each of these as that could be a completely separate article. It’s just important that you know what gas system you are running so that you can match your handguard to this. If you don’t match your gas tube and handguard you could buy a handguard that doesn’t cover your gas block.
I purchased the Aero Precision M5 Atlas S-One M-LOK handguard. I’m not a fan of quad rails as they are heavy, and uncomfortable. M-LOK or Keymod handguards allow you to run as many accessories all over your handguard as wanted without the bulk and sharp edges of a quadrail. The Atlas S-One is also lighter than the other options offered by Aero Precision. There are carbon fiber handguards that are extremely lightweight but also extremely expensive. As with all things I had to weigh performance vs costs and I simply could not justify the added costs of a complete carbon fiber handguard.
Upper Receiver Considerations
There is one major advantage of using an upper receiver and a handguard from the same manufacturer. That advantage is aesthetically they line up much better than if you source parts from different manufacturers. The majority of people will select the standard A2 style birdcage for their rifle. These are very affordable and do a decent job of flash suppression and recoil mitigation. I prefer a compensator due to the greater flash suppression.
Lower Receiver Components
I will now move onto the more complex and more AR-15 part compatible, lower receiver. The lower receiver consists of a bolt stop, front and rear takedown pins, magazine release, fire control group (FCG), pistol grip, buffer tube assembly, and stock. The lower receiver is, by law, the serialized firearm. Due to the hassles of buying firearms online and a desire to support local business I typically purchase a lower receiver from my local gun store. However, these can be purchased online and sometimes in multi-receiver sets which can save you money. I have found a local FFL that doesn’t charge a transfer fee, so when I do purchase online I use them to broker the deal. I would recommend doing a little research and with some luck you might find a similar situation in your area.
At this point it probably isn’t much of a surprise for me to tell you that I selected an Aero Precision lower receiver. This is due to the previously mentioned aesthetics of having your upper, lower and handguard line up. Aero Precision also has a good reputation in the LR-308 world and in the AR-15 world for that matter. They have many options of factory Cerakote components but I purchased the black components and coated them myself to my specifications. The lower receiver does have a few components that are compatible with the AR-15 I will identify those components as I list each component of the lower receiver.Continue reading“Why I Chose a .308 Winchester AR – Part 2, by Dusty”