Sharps Bro’s “Overthrow” AR-15
Welcome to our blog, where we embark on a thrilling journey to build the Spartan Overthrow AR-15. If you’re an AR-15 enthusiast, a firearms aficionado, or simply curious about assembling a high-quality, custom rifle, you’ve come to the right place. The Spartan Overthrow build is a project that promises to deliver performance and style inspired by the legendary warriors of Sparta. In this blog, we will take you through every step of this build, from selecting components to assembly, and provide insights, recommendations, and insider tips to ensure your AR-15 is not only a formidable tool but also a work of art. So, prepare to channel your inner warrior and join us on this journey as we conquer the world of Spartan Overthrow AR-15 builds.
Table of contents
- Sharps Bro’s “Overthrow” AR-15
- Spartan Build
- Why Another Themed AR-15?
- Parts in Our Spartan AR-15 Build
- Upper Receiver
- Bolt Carrier Group
- Charging Handle
- Ejection port cover/dust cover
- Forward Assist
- Overthrow AR-15 Build Video
- Barrel
- Gas System
- Handguard
- Overthrow AR-15 Photo Gallery
- Lower Receiver
- Trigger
- Pistol Grip
- Buffer System and Stock
- Stock
- More Overthrow AR-15 Photos
- Frequently Asked Custom Build Questions
Spartan Build
The “Overthrow Spartan” build was our second in the Sharps Brothers lower receiver AR15 builds. The first was the “Skull-themed Jack” build. Our team has had a blast making these, and we couldn’t be happier with how they’ve turned out, with a lot of help from our friends at Unique Ar’s, who do amazing custom handguards and Cerakote work.
Below we’ll outline the parts we used and provide video footage of the build and a photo gallery of the final build.
Why Another Themed AR-15?
The SSP Firearms team had such a great time on the first custom-themed AR15 build we have decided to do the whole series of Sharps Brother’s Lower Receivers.
- Hellbreaker
- Livewire
- Overthrow- Done in 223 Wylde Rifle
- Showdown
- The Jack- Done in 300 Blackout Pistol
- Warthog
We’ll keep detailed information about each build and its parts on our blog and have a separate post tracking all the completed builds. For example, this Overthrow AR-15 build is a .223 Wylde Odin Works Barrel with a Franklin Armory Binary trigger system.
Parts in Our Spartan AR-15 Build
The number of parts in an AR-15 can vary depending on the specific model and configuration, but a typical AR-15 rifle consists of around 100-150 individual pieces. These parts can be broadly classified into 4 categories:
- Upper Receiver
- Lower Receiver
- Furniture and Accessories
- Small Parts
The small parts make up roughly half the parts. They consist of springs, pins, screws, detents, roll pins, and O-rings. Depending on accessories, the list grows.
Below we’ll outline all the parts and manufacturers that went into this “Overthrow Spartan AR15 build. The details on all the parts are listed below, and please feel free to email or comment with any questions.
Upper Receiver
Sharps Brothers Billet Upper Receiver
Capable of firing .223, 5.56, .224 Valkyrie, 300 BLK, and 6.5 Grendel calibers. Port opening is not large enough for 450 Bushmaster, 458 SOCOM or 50 Beowulf.
Made from 7075-T6, and out of the box, Anodized black, although ours has a Cerakote finish done by the amazing team at Unique AR’s. Comes with a forward assist kit & dust cover installed.
Upper Receiver Specifications:
- Made from billet 7075-T6 aluminum
- Mil-Spec Type III hard coat anodize
- ‘SHARPS BROS.’ discretely engraved on both sides
- Weight: 9 oz
Bolt Carrier Group
Charging Handle
Tactical Galaxy Bronze Ambidextrous Charging Handle
Charging Handle Specifications
- T6 6061 Aluminum
- For AR-15
- Fits all standard AR-15 upper receivers
Ejection port cover/dust cover
Tactical Galaxy Ejection Port Dust Cover
Dust Cover Specifications
Fits 556, 223, 6.8, 300 AAC
Stamped steel construction.
Cold-Rolled 1045 / 1055 carbon steel
Military specification heavy phosphate coating
Forward Assist
Forward Assist Specifications
Came on the Sharps brother’s upper receiver but was removed for cerakote and then put back in.
Overthrow AR-15 Build Video
Barrel
Odin Works 18″ .223 Wylde Barrel
.223 Wylde is a hybrid of the .223 REM and 5.56. .223 Wylde has a chamber throat that is tighter than the 5.56 achieving better accuracy but still reliably functional with 5.56 ammunition. All DI barrels include stainless steel tunable gas blocks.
Barrel Specifications
Profile: DMR
Length: 18″
Gas placement: Rifle
Rifling: Button 8 twist
Weight: 2.534 lbs
Made from 416R Stainless Steel
Hand-Lapped
M4 Feed ramps
1/2-28 Threading
1″ MOA guaranteed
Gas System
Odin Works Adjustable Gas Block
Stainless steel tunable gas block
Handguard
Unique AR’s Spartan Handguard
Handguard Specifications
Free-float handguard made of 6061 T6 Aluminum
Inside diameter 1.75″, exterior diameter 2″
Compatible with any mil-spec AR-15 upper receiver or (DPMS Gen 1 Style) AR-10 upper
Unique-ARs proprietary Picatinny rails
Overthrow AR-15 Photo Gallery
Lower Receiver
Sharps Bro’s Overthrow AR-15 Lower Receiver
Sharps Bros Overthrow is an open magazine well helmet design with battle-worn dents, sword gashes, and crack lines. We went with the Spartan theme, but you could do Viking. The lower comes in Black, but we worked with the talented team at Unique Ar’s, who did the Cerakote finish.
Receiver Specifications
- Machined top to bottom from 7075-T6 aluminum
- A hard coat anodize finish per MIL-A-8625
- Full compatibility with all mil-spec internal parts
- Full compatibility with all other aftermarket mil-spec upper receivers
- Full compatibility with GI standard issue magazines as well as PMags
- Multi caliber mark
Trigger
Franklin Armory Binary Trigger System
Trigger Specifications
- The release round can be canceled by simply moving our Patented selector out of Binary® mode while holding the trigger back
- Easy to install * Smooth trigger pull: 4.5 lbs, +/- 0.5 lbs
- Positive reset on release phase
- Enhanced buffer springs for optimal flexibility
- Works in most AR platforms and calibers including 5.56 NATO, 308 Win, 300 BLK, 9mm, Rimfire, etc….
- Compatible with most Bolt Carrier Groups (BCG)
- Great for competition shooters, tactical shooters, and recreational enthusiasts
Pistol Grip
Name of pistoil grip
Buffer System and Stock
Stock
More Overthrow AR-15 Photos
Frequently Asked Custom Build Questions
Yes, it is legal to build your AR-15 for personal use in most states in the US. However, checking your local laws and regulations before starting the build process is important.
Some essential tools you will need for building an AR-15 include:
Armorer’s wrench
Punch set
Vise block
Barrel nut wrench
Torque wrench
Pin starter punch
Hammer
Screwdrivers
Building an AR-15 can vary depending on your chosen components, but a basic build can cost around $500-$700. However, the cost can be much more expensive if you choose higher-end components or want to customize your rifle extensively.
The build time can vary depending on your experience level and the complexity of the build. For example, a beginner can expect to spend 6-8 hours on their first build, while an experienced builder may be able to complete the build in 2-3 hours and sometimes in half that time.
No, prior knowledge or experience is not necessary. Still, it is recommended that you do your research and understand how the rifle functions before starting the build process.
Yes, one benefit of building your AR-15 is the ability to customize it to your specific preferences. For example, you can choose different barrel lengths, calibers, trigger assemblies, stocks, handguards, etc…
No. Although you do not need special permits to build an AR-15 for personal use, but you should ensure that the rifle complies with all federal and state laws and regulations.
