Ready Stock 308 Upper Builds Kit: AR-15 & LR

17 Design AR-308 upper receiver : r/AR10

Building an AR-10 upper is a great way to customize your AR-15 or LR-308. Whether you want to change up the look of your rifle or add more versatility, building an upper receiver is a quick and easy process that doesn’t require any special tools. In this article we’ll go over what 308 uppers are, how they differ from other upper receivers, and how to build one for yourself!

What is a 308 upper?

The 308 upper receiver is the part of your rifle that holds everything together. It’s what connects your barrel to your lower, and it also houses the bolt carrier group (BCG). The 308 upper receiver can be used on either AR-15 or LR-308 lowers, but they’re not interchangeable between platforms.

What uppers go on AR-10?

The AR-10 upper receiver has a larger Magwell and bolt than the AR-15. So, if you’re looking for an 308 uppers that will fit on your AR-10 rifle, it needs to be designed specifically for that purpose.

There are two ways to go about this: either buy a complete 308 upper or build one yourself from parts. A complete upper means exactly what it sounds like–the entire assembly is ready to go right out of the box and requires no additional assembly work on your part; however, these tend not only be expensive but also limited by availability (especially if they’re popular). Building from parts allows you more flexibility in terms of customizing what goes into your gun as well as saving money over time since there’s no need for constant upgrades or replacements when new products come out (though some may argue that this isn’t always true).

Can I put a 308 upper on a 556 lower?

Yes, you can put a 308 upper on a 556 lower. To do this, you will need to use a 308 upper receiver and a 556 lower receiver; however, if you have an AR-15 with multiple calibers (i.e., multi-caliber), then the bolt carrier group and magazine should be compatible with both calibers.

Can an AR-10 upper on a AR15 lower?

Yes, it is possible to use an AR10 upper on a standard AR15 lower. However, there are some things that need to be changed out in order for this to work:

  • The bolt carrier group (BCG) will need to be swapped out for one that has been designed for 308 ammunition instead of 556. This means you’ll have to purchase an entire BCG set from a company like DPMS or Rock River Arms.
  • Depending on the type of lower receiver you have, there may be some modifications required as well – such as changing out the buffer system with one built specifically for 308 rifles or modifying any other parts that might interfere with feeding rounds into the chamber properly. You’ll also need magazines designed specifically for use with 308-caliber rifles if you want them available at all times during combat situations!

The best 308 ar 10 complete uppers are here.

If you’re looking for the best 308 ar 10 complete uppers, this article is for you. We’ll be going over some of the most popular and well-reviewed options on the market today.

The DPMS 10.5 inch upper features a lightweight design, as well as an A2 style sight tower and barrel nut that makes it easy to install. The barrel has been chrome lined for added durability and corrosion resistance in harsh environments like mud or salt water environments where you might want to shoot it from time to time!

The Aero Precision M5E1 Complete Upper Receiver features a magnesium alloy ambidextrous bolt catch assembly so that lefties aren’t left out when it comes time for fun shooting sessions with friends at ranges near where they live! This kit also includes an 18″ stainless steel barrel made by Faxon Firearms which has been treated with melonite finish so that it resists wear better than other types of finishes when exposed repeatedly over long periods of time (like those who enjoy hunting).

Best ar-10 308 upper receiver

If you’re looking for the best AR-10 308 upper receiver, look no further. We’ve got all of the best options here.

  • Aero Precision M5E1 Complete Upper Receiver – The Aero Precision M5E1 303 Complete Upper Receiver is a great choice if you want an AR-10 with an eye toward quality and performance. It features a lightweight platform as well as Magpul parts like their MBUS (magazine bracket/back up sight) and MOE+ pistol grip. This is a complete kit so all you’ll need is an optic or iron sights, depending on your preference!
  • DPMS 10.5″ 308 Ar-15 Upper – The DPMS 10.5″ 308 Ar-15 Upper will give any standard AR lower receiver assembly plenty of room to grow into as far as caliber changes are concerned–the barrel itself measures 16 inches long while being compatible with any standard size 556 NATO magazine (30 round).

Aero precision m5e1 complete upper in stock

The Aero Precision M5E1 Complete Upper Receiver is a great addition to any AR-15 build. This upper is made from 7075 T6 aluminum and features an M4 flat top with a Picatinny rail for adding accessories like lights, lasers and optics. The rear of the upper receiver has a forged mil-spec bolt carrier group without forward assist or ejection port door cover. It also includes an A2 flash hider so you can add your own suppressor if you choose.

7.5 ar10 complete upper

  • 5 AR10 Complete Upper

The 7.5″ complete upper is designed to work with your existing bolt carrier group and lower receiver. It’s compatible with any Mil-Spec dimensioned AR-15 lower receiver, so you can use it on whichever platform you prefer! This 7.5″ model features a 20″ stainless steel barrel chambered in .308 Win/7.62 NATO that has been machined with M4 feed ramps for reliable feeding from box magazines as well as USGI magazines (not included). The muzzle is threaded 5/8 x 24 TPI for easy installation of muzzle devices such as flash hiders or suppressors (both sold separately). The upper has been finished off with an FDE Cerakote finish which provides excellent corrosion resistance while still looking great!

Lmt mws upper

If you’re looking for an upper that’s ready to go right out of the box, look no further than our M5E1 complete upper. The M5E1 is a mid-length 16″ barreled rifle with a forged 7075-T6 aluminum receiver and billet assembly for added strength. It features an integrated forward assist, dust cover, brass deflector, laser engraved T-markings on the top rail and comes with a Magpul MOE stock and pistol grip as well as a LMT SOPMOD buttstock kit (stock not included).

This model also available with an FSP cutout for those who want to use their own sights/optics instead of using one of our upgraded uppers.

We also offer two different varieties of 7.5″ AR10 uppers: one with a standard DPMS style flat top rail & another version with our own custom Aero Precision M5E1 style railed handguard which has been designed specifically for this size platform! These two options give you more flexibility when choosing your optic setup since they both accept either Picatinny or Weaver style rings (though we recommend sticking with Picatinny if possible).

Where can I buy a 308 upper Online

If you’re looking to buy an AR-10 upper, the first place to look is online. There are a lot of places where you can buy uppers for sale, but we recommend Aero Precision as a great source. Their products are high quality and come with a lifetime warranty. In addition to selling complete uppers, they also sell just about every piece that goes into building one yourself (from barrels and bolts to handguards). If you’re looking for an easy way out and don’t want to mess around with all those little pieces yourself then this is definitely your best bet!

AR-308 & AR-10 Upper Receivers For Sale

If you’re looking for a complete upper, we have a few options available. We also have a variety of upper receiver parts and barrel assemblies available for sale.


We hope this article has helped you understand the differences between AR-10 and LR-308 uppers, as well as their compatibility with different lower receivers. The most important takeaway is that it’s possible to build a 308 upper on an AR-15 lower receiver if you’re willing to do some research and make sure everything fits correctly.

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