Do PSA lowers and uppers fit together?
PSA lower + upper: yes, they fit
Yes. Palmetto State Armory (PSA) AR-15 lowers and uppers fit together. 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. Their AR-10 (.308) lowers and uppers fit each other too.
One exception: PSA AR-15 lowers are a smaller frame and do not fit PSA AR-10 (.308) 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 PSA AR-15inStealth Stripped lower with the PSA Built Stealth upper.
PSA is the most picked upper brand on PSA lowers.
PSA sells affordable AR lowers, uppers, BCGs and complete rifles, and it makes them in house from forging to finished part.
Founded 2008, Columbia, South Carolina, Made in USA
PSA lowers and lowers 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) | Yes, they fit |
| AR-15 lower + AR-10 (.308) upper | No, they do not fit |
AR-15: yes, they fit
Both are AR-15 size receivers. The upper is stripped, so the barrel you pick sets the caliber.
Checked on this PSA lower
PSA Lower Magpul MOE EPT Edition$179.99and this PSA lower
PSA Built Stealth Upper Receiver$99.99AR-10 (.308): yes, they fit
Both are DPMS Gen 1 (LR-308) pattern AR-10 parts. An AR-10 (.308) lower takes the upper's .308 Win.
Checked on this PSA lower
PSA GEN3 PA10 Forged MOE EPT SBA4 .308 Lower$209.99and this PSA lower
PSA GEN3 PA10 20" Rifle-Length .308 WIN 1:10 Stainless$499.99AR-15 lower + AR-10 (.308) upper: no, they do not fit
The lower receiver (AR-15) cannot support a AR-10/.308 build.
Checked on this PSA lower
PSA Lower Magpul MOE EPT Edition$179.99and this PSA lower
PSA GEN3 PA10 20" Rifle-Length .308 WIN 1:10 Stainless$499.99Most built PSA lowers and lowers setups
Ranked by how often builders pick the exact pair. Only pairs our rules pass are listed.
#1Yes, they fit7% of these buildsCheck fit
#2Yes, they fit3% of these buildsCheck fit
#3Yes, they fit3% of these buildsCheck fit
#4Yes, they fit2% of these buildsCheck fit
#5Yes, they fit1% of these buildsCheck fit
#6Yes, they fit1% of these buildsCheck fit
#7Yes, they fit1% of these buildsCheck fit
#8Yes, they fit1% of these buildsCheck fit
What PSA says
PSA: PSA owns its supply chain, including Spartan Forging and DC Machine, from forging the receivers to finishing the muzzle brake.
PSA: PSA's Gen3 PA10 lowers work with Gen1 and Gen2 PA10 uppers, but Gen3 with Gen3 is recommended for the best look and performance, since mixed generations differ on the outside.
PSA: The PSA PA-10 follows the DPMS pattern, so it can use a wide range of DPMS style parts.
PSA: The AR-10 has no common design across makers the way the AR-15 does, so use only PSA PA10 parts in PSA's PA10 receivers and not other makers' parts.
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 PSA lowers
- PSA lowers + BCM uppersSecond most picked
- PSA lowers + Aero uppersThird most picked
- PSA lowers + TacFire uppersFourth most picked
- PSA lowers + Geissele uppersFifth most picked
- PSA lowers + Radical uppersSixth most picked
- PSA lowers + Daniel Defense uppersSeventh most picked
- PSA lowers + Wilson Combat uppersEighth most picked
- PSA lowers + YHM uppersNinth most picked
Other lowers under PSA uppers
- Aero lowers + PSA uppersSecond most picked
- Smith & Wesson lowers + PSA uppersThird most picked
- Wilson Combat lowers + PSA uppersFourth most picked
- Spike's lowers + PSA uppersFifth most picked
- Sharps Bros lowers + PSA uppersSixth most picked
PSA lowers and uppers: questions builders ask
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 a PSA AR-10 lower fit a PSA upper?
PSA AR-10 (.308) lowers and uppers fit together. Both are DPMS Gen 1 (LR-308) pattern AR-10 parts. PSA AR-15 lowers are a smaller frame and do not fit PSA AR-10 (.308) uppers.
Why might a PSA upper feel loose or tight on a PSA 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.