Do Aero lowers fit Wilson Combat uppers?
Aero lower + Wilson Combat upper: yes, they fit
Yes. Aero Precision AR-15 lowers fit Wilson Combat AR-15 uppers. Both are AR-15 size receivers. A real mil-spec keeps AR-15 receivers from different makers close, though not exact, and fit problems show up most when the upper and lower come from different makers. We checked them with the rules the AR builder runs.
One exception: Aero AR-10 (.308) lowers are a larger frame and do not fit Wilson Combat AR-15 uppers.
Fit comes from the same rules the AR builder runs on every part you add. Build data only ranks the setups; it never decides fit. Checked October 31, 2026.
Our take
Most built setup: the Aero Stripped M4E1 lower with the Wilson Combat Billet upper.
About 1 in 15 Aero lowers in our builds carries a Wilson Combat upper.
Aero makes forged AR receivers, mainly the M4E1 line, with a billet look that still takes standard mil-spec parts. They also make complete uppers, charging handles and rifles.
Founded 1994, Tacoma, Washington, Made in USA
Wilson Combat is the custom 1911 shop from Berryville, Arkansas, and AR folks know it for barrels, drop-in triggers and accuracy tested rifles.
Founded 1977, Berryville, Arkansas, Made in USA
Aero lowers and Wilson Combat uppers by platform
Each row is checked on the most built part of that platform from each brand.
| Platform | Fit |
|---|---|
| AR-15 | Yes, they fit |
| AR-10 (.308) lower + AR-15 upper | No, they do not fit |
AR-15: yes, they fit
Both are AR-15 size receivers.
Checked on this Aero lower
Aero Precision Stripped M4E1 Lower Receiver$154.99, out of stockand this Wilson Combat upper
Wilson Combat Billet Upper Receiverout of stockAR-10 (.308) lower + AR-15 upper: no, they do not fit
The lower receiver (.308 Win) cannot support a AR-15 Standard (5.56/.223/.300 BLK etc.) build.
Checked on this Aero lower
Aero Precision M5 Receiver Set Clear Anodized .308 Win$325.00, out of stockand this Wilson Combat upper
Wilson Combat Billet Upper Receiverout of stockMost built Aero lowers and Wilson Combat uppers setups
Ranked by how often builders pick the exact pair. Only pairs our rules pass are listed.
#1Yes, they fit35% of these buildsCheck fit
#2Yes, they fit24% of these buildsCheck fit
#3Yes, they fit10% of these buildsCheck fit
#4Yes, they fit9% of these buildsCheck fit
#5Yes, they fit7% of these buildsCheck fit
#6Yes, they fit6% of these buildsCheck fit
#7Yes, they fit5% of these buildsCheck fit
#8Yes, they fit0.4% of these buildsCheck fit
Watch the frame size. Builders also pair parts our rules say do not fit, like these two: Lower Receiver (.308 Win) cannot support an AR-15 Standard (5.56/.223/.300 BLK etc.) build.
What Aero and Wilson Combat say
Aero Precision: The M4E1 upper is forged 7075-T6 with a billet style look, and it still takes a standard barrel nut and mil-spec parts.
Aero Precision: The Aero M5 lower is DPMS pattern, but its lower parts kit uses an extended magazine release button to make up for the thicker receiver.
Aero Precision: Aero's M5 lower works with standard AR-308 parts and magazines, but Aero recommends its own M5 lower parts kit, which has custom takedown and pivot pins and an extended magazine catch button.
Aero Precision: The rear takedown pin detent hole on Aero's Gen 2 AR15 lower is threaded for a 4-40 set screw.
Wilson Combat: Wilson Combat's billet AR-10 lower fits Wilson billet WC-10 uppers only.
Wilson Combat: Wilson Combat's .308 uppers only fit Wilson made lowers and will not fit any other brand's .308 AR lower.
Wilson Combat: Wilson Combat's enhanced AR-10 upper will not take some aftermarket bolt releases.
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.
Other uppers builders put on Aero lowers
- Aero lowers + Aero uppersMost picked
- Aero lowers + BCM uppersSecond most picked
- Aero lowers + Geissele uppersThird most picked
- Aero lowers + PSA uppersFifth most picked
- Aero lowers + Daniel Defense uppersSixth most picked
- Aero lowers + Radical uppersSeventh most picked
- Aero lowers + YHM uppersEighth most picked
- Aero lowers + TacFire uppersNinth most picked
Other lowers under Wilson Combat uppers
- Wilson Combat lowers + Wilson Combat uppersSecond most picked
- PSA lowers + Wilson Combat uppersThird most picked
Aero lowers and Wilson Combat uppers: questions builders ask
Will a Wilson Combat upper fit an Aero lower?
Yes. Aero AR-15 lowers fit Wilson Combat AR-15 uppers. Both are AR-15 size receivers.
Do I need a matched upper and lower?
A real mil-spec keeps AR-15 receivers from different makers close, though not exact, and fit problems show up most when the upper and lower come from different makers.
Does an Aero AR-10 lower fit a Wilson Combat upper?
Aero AR-10 (.308) lowers are a larger frame and do not fit Wilson Combat AR-15 uppers.
Why might a Wilson Combat upper feel loose or tight on an Aero lower?
Some play between an AR-15 upper and lower is common, but it can get excessive when the two come from different makers, and a tension screw or an Accu-Wedge takes it up.