Our lowers are assembled by SOTAR-trained master armorers in North Carolina using components manufactured exclusively in the USA.
Below are some highlights of features of our Scorpio-10EM lower:
- Aero Precision M5 Stripped Lower Receiver
- The Aero M5 lower has the best combination of features, quality, and value for an AR-10. It offers unlimited potential for a build.
- Everything Mil-Spec or Better
- We build our lowers with true Mil-Spec or better components. It is important to emphasize this because many claim to use Mil-Spec components, but use components made of inferior materials/quality. We refuse to cut corners to save a buck.
- Buffer: Standard AR-10 Rifle Buffer
- Buffer Spring: Mil-Spec Round Wire Buffer Spring
- Buttstock: Luth-AR MBA-2 Rifle Buttstock
- Grip: Mil-Spec A2 Grip
- Magazine Release Button: Mil-Spec Steel Magazine Release Button
- Trigger: Schmid Tool GI Fire Control Group
- We spent a little extra on the Schmid GI FCG. This trigger group is truly Mil-Spec (Schmid makes these for the Military) and it is masterfully executed. We should note that Mil-Spec is a lot better than what many companies put in their guns…as always, beware the “Mil-Spec” claims (or worse, a lack thereof).
- Safety Selector: Mil-Spec GI Safety Selector
Critical finishes and dimensions of individual components are inspected before they we accept them into inventory. To learn more about our quality control gauging and inspection, visit our Quality Promise page.
Each upper receiver includes the following assembly and QC steps (full schedule of all 82 points of inspection for our builds can be found in our Quality Promise page):
- Receiver extension (buffer tube) threads lubricated with AeroShell grease.
- Receiver extension torqued to 37 ft. lbs.
- Trigger sear, hammer sear notch, hammer hook, and disconnector honed, as necessary.
- Full lubrication with our own lubricant blend per our standard procedure.
- Full safety and function check per our standard procedure.
- Live fire test with M193 or M855.
The tables below detail what we put in the lower and what you are paying.
Scorpio-10EM Lower Receiver (Black)
| Part Type | Part | Price |
|---|---|---|
| Lower Receiver | Aero Precision M4E1 Stripped Lower, Black | 155.00 |
| Pivot/Takedown Pins | PBA Mil-Spec AR15 Pivot Pin, Phosphate | 4.99 |
| Pivot/Takedown Pins | PBA Mil-Spec AR15 Takedown Pin, Phosphate | 4.99 |
| PTP Detents | PBA Mil-Spec PTP Detent | 0.99 |
| PTP Springs | PBA Mil-Spec PTP Detent Spring | 1.99 |
| Magazine Catch | PBA Mil-Spec Magazine Catch, Phosphate | 4.99 |
| Magazine Catch Spring | PBA Mil-Spec Magazine Catch Spring | 1.25 |
| Magazine Release Button | PBA Mil-Spec Mag Release Button, Black | 1.50 |
| Bolt Catch | PBA Mil-Spec AR-15 Bolt Catch | 6.99 |
| Bolt Catch Buffer | PBA Mil-Spec Bolt Catch Buffer | 0.75 |
| Bolt Catch Spring | PBA Mil-Spec Bolt Catch Spring | 0.50 |
| Trigger Group | Schmid Tool GI FCG | 39.99 |
| Trigger/Hammer Pins | PBA Mil-Spec THP, Phosphate | 1.99 |
| Safety Selector | PBA Mil-Spec Safety Selector | 9.00 |
| Safety Selector Detent | PBA Mil-Spec Safety Selector Detent | 1.49 |
| Safety Selector Spring | PBA Mil-Spec Safety Selector Spring | 1.25 |
| Pistol Grip | PBA Mil-Spec A2 Pistol Grip | 4.50 |
| PG Screw | PBA Pistol Grip Screw | 0.99 |
| PG Lock Washer | PBA Pistol Grip Lock Washer | 0.99 |
| Receiver Extension | PBA Rifle Receiver Extension, Black | 30.00 |
| Buffer Retainer Pin | PBA Mil-Spec Buffer Retainer | 0.99 |
| Buffer Retainer Spring | PBA Mil-Spec Buffer Retainer Spring | 0.99 |
| Buffer (System) | PBA AR-15 Rifle Buffer | 17.95 |
| Buffer Spring | PBA AR15 Rifle Buffer Spring | 3.99 |
| Buttstock | Luth-AR MBA-2 Rifle Buttstock, Black | 49.95 |
| Build Fee | Lower Build Fee | 100.00 |
| Firearm and Ammunition Excise Tax | Rifle FAET (11%) | 49.28 |
| ∑ = 497.29 |
Scorpio-10EM Lower Receiver (FDE)
| Part Type | Part | Price |
|---|---|---|
| Lower Receiver | Aero Precision M4E1 Stripped Lower, FDE | 175.00 |
| Pivot/Takedown Pins | PBA Mil-Spec AR15 Pivot Pin, Phosphate | 4.99 |
| Pivot/Takedown Pins | PBA Mil-Spec AR15 Takedown Pin, Phosphate | 4.99 |
| PTP Detents | PBA Mil-Spec PTP Detent | 0.99 |
| PTP Springs | PBA Mil-Spec PTP Detent Spring | 1.99 |
| Magazine Catch | PBA Mil-Spec Magazine Catch, Phosphate | 4.99 |
| Magazine Catch Spring | PBA Mil-Spec Magazine Catch Spring | 1.25 |
| Magazine Release Button | PBA Mil-Spec Mag Release Button, Black | 1.50 |
| Bolt Catch | PBA Mil-Spec AR-15 Bolt Catch | 6.99 |
| Bolt Catch Buffer | PBA Mil-Spec Bolt Catch Buffer | 0.75 |
| Bolt Catch Spring | PBA Mil-Spec Bolt Catch Spring | 0.50 |
| Trigger Group | Schmid Tool GI FCG | 39.99 |
| Trigger/Hammer Pins | PBA Mil-Spec THP, Phosphate | 1.99 |
| Safety Selector | PBA Mil-Spec Safety Selector | 9.00 |
| Safety Selector Detent | PBA Mil-Spec Safety Selector Detent | 1.49 |
| Safety Selector Spring | PBA Mil-Spec Safety Selector Spring | 1.25 |
| Pistol Grip | PBA Mil-Spec A2 Pistol Grip | 4.50 |
| PG Screw | PBA Pistol Grip Screw | 0.99 |
| PG Lock Washer | PBA Pistol Grip Lock Washer | 0.99 |
| Receiver Extension | PBA Rifle Receiver Extension, Black | 30.00 |
| Buffer Retainer Pin | PBA Mil-Spec Buffer Retainer | 0.99 |
| Buffer Retainer Spring | PBA Mil-Spec Buffer Retainer Spring | 0.99 |
| Buffer (System) | PBA AR-15 Rifle Buffer | 17.95 |
| Buffer Spring | PBA AR15 Rifle Buffer Spring | 3.99 |
| Buttstock | Luth-AR MBA-2 Rifle Buttstock, FDE | 49.95 |
| Build Fee | Lower Build Fee | 100.00 |
| Firearm and Ammunition Excise Tax | Rifle FAET (11%) | 51.48 |
| ∑ = 519.49 |
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