Lower Receivers
Aero Precision Lower Receivers
The M4E1 lower reworked the standard forging with threaded takedown pin detents and an integrated trigger guard, and became the default mid-price builder lower.
Status: In court-supervised receivership since 5 May 2026. Still manufacturing and shipping; confirm warranty terms before buying. Source.
Current lower receivers
| Model | Type | Construction | Notable features |
|---|---|---|---|
| M4E1 Stripped | Stripped | Forged 7075-T6 | Threaded takedown pins, integral trigger guard |
| AR15 Stripped (M4) | Stripped | Forged 7075-T6 | Standard mil-spec pattern |
| M5 Stripped | Stripped | Forged 7075-T6 | DPMS-pattern .308 |
| M4E1 Builder Set | Matched set | Forged 7075-T6 | Upper and lower finished together |
Line-up checked against the manufacturer's catalogue. Checked 2026-08-01