Does the Harrington & Richardson BLEM Harrington work with the Aero Precision M4E1 Threaded Upper?

Lower Receiver
Harrington & Richardson BLEM Harrington & Richardson M16A1

Upper Receiver
Aero Precision M4E1 Threaded Upper
from $593.99
Harrington & Richardson lower and Aero Precision upper compatibility
Yes, they fit
The Harrington & Richardson BLEM Harrington & works with the Aero Precision M4E1 Threaded Upper. Our compatibility rules found no conflict between them.
No one has built this exact setup yet, but Harrington & Richardson lowers with Aero Precision uppers are a common pairing.
Counted from real GunPartPicker builds: parts lists people put together while planning to buy.
Checked by the same rules the AR builder runs on every part you add: caliber, frame size, receiver pattern, thread pitch and gas length.
Fit is judged from the specs retailers list, which can be missing or wrong. Confirm with the manufacturer before you buy, and have a qualified gunsmith check any build before you fire it.
How often builders pair the Harrington & Richardson lower and Aero Precision upper
Backed by tens of thousands of qualified builds that have both a lower and an upper.
Share of builds with the Aero Precision M4E1 Threaded Upper and any lower
Harrington & Richardson BLEM Harrington
- Of lower picks
- 0%
- Median paid
- n/a
Aero Precision M4E1 Threaded Upper
- Of upper picks
- 2.3%
- Median paid
- $594
How we count ⌄
These shares come from GunPartPicker's build data: real parts lists people put together while planning a purchase, not sales or surveys. A build counts a part only when it is the final pick for its slot, so parts that were swapped out never count. Fit never comes from these numbers; it comes from our compatibility rules alone.
Frequently built with the Harrington & Richardson lower and Aero Precision upper
The part builders pick most often in each slot alongside these two, checked against both. Parts that conflict are left out.
Charging Handle

Aero Precision Breach Small Levers
Fits both
Stock & Brace
Pistol Grip
Suppressor
Harrington & Richardson BLEM vs Aero Precision M4E1 Threaded: specs and prices
| Harrington & Richardson BLEM | Aero Precision M4E1 Threaded | |
|---|---|---|
| Best price | n/a | $593.99 at AR15 Discounts |
| Stores | n/a | 0 of 2 in stock |
| Assembly | Complete | Complete |
| Platform | AR-15 | AR-15 |
| Caliber | 5.56 NATO | 5.56 NATO |
| Trigger Pin | .154 | n/a |
| Color | Black | n/a |
| Gas System Length | n/a | Mid-Length |
| Receiver Type | n/a | M4E1 |
| Length | n/a | 16 |
Today's best prices and 90 day price history
Every store we track for each part, cheapest in stock first. Prices are checked through the day.
Price history, last 90 days
- Aero Precision M4E1 Threaded Upper: lowest $593.99 on Jul 5, highest $624.99 on Jul 14 over the last 90 days.
Upper Receivers most paired with Harrington & Richardson lowers
The Harrington & Richardson BLEM Harrington is not in enough builds yet, so these are the most picked next to any Harrington & Richardson lower. Only parts our rules say fit the Harrington & Richardson BLEM Harrington are listed.

Tacfire 10" Upper 9mm 1:10
Fits, check noteCheck fit

PSA GEN4 8" 9mm 1/10 Suppressor Ready 10" M-LOK Upper
Fits, check noteCheck fit


Lower Receivers frequently paired with the Aero Precision M4E1 Threaded Upper
Most picked next to it in real builds. Only parts our rules say fit the Aero Precision M4E1 Threaded Upper are listed.












