Do PSA lowers fit Battle Arms Development uppers?
PSA lower + Battle Arms Development upper: yes, they fit
Yes. Palmetto State Armory (PSA) AR-15 lowers fit Battle Arms Development 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 14, 2026.
Our take
Most built setup: the PSA Lower Magpul MOE EPT Edition with the Battle Arms Development upper.
About 1 in 100 PSA lowers in our builds carries a Battle Arms Development upper.
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
Battle Arms Development (BAD) makes ambidextrous AR controls like the BAD-ASS safety selector and The RACK charging handle, plus complete rifles.
Founded 2009, Henderson, Nevada, Made in USA
PSA lowers and Battle Arms Development 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 PSA lower
PSA Lower Magpul MOE EPT Edition$189.99and this Battle Arms Development upper
Battle Arms Development Workhorse Barreled Upper$473.47Most built PSA lowers and Battle Arms Development uppers setups
Ranked by how often builders pick the exact pair. Only pairs our rules pass are listed.
#1Yes, they fit34% of these buildsCheck fit
#2Yes, they fit14% of these buildsCheck fit
#3Yes, they fit11% of these buildsCheck fit
#4Yes, they fit9% of these buildsCheck fit
#5Yes, they fit5% of these buildsCheck fit
#6Yes, they fit2% of these buildsCheck fit
#7Yes, they fit2% of these buildsCheck fit
#8Yes, they fit2% of these buildsCheck fit
What PSA and Battle Arms Development say
PSA: PSA owns its supply chain, including Spartan Forging and DC Machine, from forging the receivers to finishing the muzzle brake.
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 + PSA uppersMost picked
- PSA lowers + BCM uppersSecond most picked
- PSA lowers + TacFire uppersThird most picked
- PSA lowers + Aero 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
Other lowers under Battle Arms Development uppers
- Aero lowers + Battle Arms Development uppersFifth most picked
PSA lowers and Battle Arms Development uppers: questions builders ask
Will a Battle Arms Development upper fit a PSA lower?
Yes. PSA AR-15 lowers fit Battle Arms Development 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 Battle Arms Development 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.