Do Wilson Combat lowers fit CMMG uppers?
Wilson Combat lower + CMMG upper: yes, they fit
Yes. Wilson Combat AR-15 lowers fit CMMG 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.
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 November 10, 2026.
Our take
Most built setup: the Wilson Combat Forged lower with the CMMG Resolute 16.10in Upper.
About 1 in 45 Wilson Combat lowers in our builds carries a CMMG upper.
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
CMMG makes complete AR rifles, pistols and parts, and it's known for Radial Delayed Blowback, its action for pistol caliber ARs in rounds like 10mm and .45 ACP.
Founded 2002, Boonville, Missouri, Made in USA
Wilson Combat lowers and CMMG 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-15: yes, they fit
Both are AR-15 size receivers. An AR-15 lower takes the upper's 5.56 NATO.
Checked on this Wilson Combat lower
Wilson Combat Lower Receiver Forged$99.99, out of stockand this CMMG upper
CMMG Resolute 16.10" Upper 5.56x45mm$403.20Most built Wilson Combat lowers and CMMG uppers setups
Ranked by how often builders pick the exact pair. Only pairs our rules pass are listed.
#1Yes, they fit42% of these buildsCheck fit
#2Yes, they fit4% of these buildsCheck fit
#3Yes, they fit4% of these buildsCheck fit
#4Yes, they fit4% of these buildsCheck fit
#5Yes, they fit4% of these buildsCheck fit
#6Yes, they fit4% of these buildsCheck fit
#7Yes, they fit4% of these buildsCheck fit
#8Yes, they fit4% of these buildsCheck fit
What Wilson Combat and CMMG say
Wilson Combat: Wilson Combat's billet AR-15 lower pairs with standard GI style uppers or its own BILLet-AR uppers, though some minor fitting may be needed.
CMMG: A CMMG DISSENT upper fits most of CMMG's BANSHEE, RESOLUTE and ENDEAVOR lowers only after you pull the buffer tube and stock and install the adapter plate that comes with the upper.
CMMG: CMMG does not guarantee its DISSENT runs right with mil-spec or other aftermarket triggers.
CMMG: American Rifleman reported that CMMG's 5.7 AR Conversion magazine fits a standard AR-15 magazine well and works with CMMG's 5.7x28 upper, and CMMG recommends a standard carbine buffer and action spring.
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 Wilson Combat lowers
- Wilson Combat lowers + BCM uppersMost picked
- Wilson Combat lowers + Wilson Combat uppersThird most picked
- Wilson Combat lowers + PSA uppersFourth most picked
- Wilson Combat lowers + Aero uppersFifth most picked
- Wilson Combat lowers + TacFire uppersFifth most picked
- Wilson Combat lowers + Geissele uppersEighth most picked
- Wilson Combat lowers + Daniel Defense uppersNinth most picked
Other lowers under CMMG uppers
- CMMG lowers + CMMG uppersMost picked
- PSA lowers + CMMG uppersSecond most picked
- Aero lowers + CMMG uppersThird most picked
- Smith & Wesson lowers + CMMG uppersFourth most picked
Wilson Combat lowers and CMMG uppers: questions builders ask
Will a CMMG upper fit a Wilson Combat lower?
Yes. Wilson Combat AR-15 lowers fit CMMG 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.
Why might a CMMG upper feel loose or tight on a Wilson Combat 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.