Do M&P 2.0 Full Size and Compact parts interchange?
The M&P9 M2.0 Full Size and Compact look almost the same, but the slide, barrel and recoil spring are each made for one length. Magazines are the part that crosses over, in one direction.
The Short Answer
- Barrels and recoil springs are made for one slide length. A Full Size barrel won't fit the Compact slide, and a Compact barrel won't fit the Full Size slide.
- S&W sells slides and frames as matched sizes. We couldn't confirm that a Full Size slide fits a Compact frame, or the other way round, so check with S&W first.
- Threaded M2.0 barrels for both sizes use 1/2x28 threads.
- Full Size magazines work in the Compact and stick out below the grip. A Compact magazine in the Full Size grip sits up inside the frame and is hard to strip out.
- The drop-in triggers we list fit both the Full Size and the Compact.
Pistol and Upgrade Slide
Each M&P9 M2.0 we list, checked against every upgrade slide.
Smith & Wesson M&P9 M2.0 Full Size 4.25", Optics Ready
- Fits Smith & Wesson M2.0 Optics Ready Slide, 4.25" (stripped)
- Check Smith & Wesson M2.0 Optics Ready Slide, 4" Compact (stripped) This is a Compact slide on a Full Size frame. S&W sells them as matched sizes and we couldn't confirm the mix fits. Check with S&W first.
Smith & Wesson M&P9 M2.0 Compact 4", Optics Ready
- Fits Smith & Wesson M2.0 Optics Ready Slide, 4" Compact (stripped)
- Check Smith & Wesson M2.0 Optics Ready Slide, 4.25" (stripped) This is a Full Size slide on a Compact frame. S&W sells them as matched sizes and we couldn't confirm the mix fits. Check with S&W first.
Smith & Wesson M&P9 M2.0 Full Size 4.625" Threaded, Optics Ready
- Fits Smith & Wesson M2.0 Optics Ready Slide, 4.25" (stripped)
- Check Smith & Wesson M2.0 Optics Ready Slide, 4" Compact (stripped) This is a Compact slide on a Full Size frame. S&W sells them as matched sizes and we couldn't confirm the mix fits. Check with S&W first.
Slide and Barrel
The barrel has to match the slide length.
Smith & Wesson M2.0 Optics Ready Slide, 4.25" (stripped)
- Fits Smith & Wesson M2.0 4.625" Threaded Barrel · Faxon M&P M2.0 Full Size Threaded Barrel · Ed Brown M&P M2.0 4.25" Threaded Barrel
- Won't fit Faxon M&P M2.0 Compact 4" Threaded Barrel · Apex Tactical M&P M2.0 Compact 4" Threaded Drop-In Barrel This barrel is made for the Compact slide; this build has the Full Size slide.
Smith & Wesson M2.0 Optics Ready Slide, 4" Compact (stripped)
- Fits Faxon M&P M2.0 Compact 4" Threaded Barrel · Apex Tactical M&P M2.0 Compact 4" Threaded Drop-In Barrel
- Won't fit Smith & Wesson M2.0 4.625" Threaded Barrel · Faxon M&P M2.0 Full Size Threaded Barrel · Ed Brown M&P M2.0 4.25" Threaded Barrel This barrel is made for the Full Size slide; this build has the Compact slide.
Pistol and Upgrade Barrel
The same barrels in each pistol's factory slide.
Smith & Wesson M&P9 M2.0 Full Size 4.25", Optics Ready
- Fits Smith & Wesson M2.0 4.625" Threaded Barrel · Faxon M&P M2.0 Full Size Threaded Barrel · Ed Brown M&P M2.0 4.25" Threaded Barrel
- Won't fit Faxon M&P M2.0 Compact 4" Threaded Barrel · Apex Tactical M&P M2.0 Compact 4" Threaded Drop-In Barrel This barrel is made for the Compact slide; this build has the Full Size slide.
Smith & Wesson M&P9 M2.0 Compact 4", Optics Ready
- Fits Faxon M&P M2.0 Compact 4" Threaded Barrel · Apex Tactical M&P M2.0 Compact 4" Threaded Drop-In Barrel
- Won't fit Smith & Wesson M2.0 4.625" Threaded Barrel · Faxon M&P M2.0 Full Size Threaded Barrel · Ed Brown M&P M2.0 4.25" Threaded Barrel This barrel is made for the Full Size slide; this build has the Compact slide.
Smith & Wesson M&P9 M2.0 Full Size 4.625" Threaded, Optics Ready
- Fits Smith & Wesson M2.0 4.625" Threaded Barrel · Faxon M&P M2.0 Full Size Threaded Barrel · Ed Brown M&P M2.0 4.25" Threaded Barrel
- Won't fit Faxon M&P M2.0 Compact 4" Threaded Barrel · Apex Tactical M&P M2.0 Compact 4" Threaded Drop-In Barrel This barrel is made for the Compact slide; this build has the Full Size slide.
Pistol and Recoil Spring
The recoil spring follows the slide length too.
Smith & Wesson M&P9 M2.0 Full Size 4.25", Optics Ready
- Fits Smith & Wesson M2.0 Full Size Recoil Spring Assembly
Smith & Wesson M&P9 M2.0 Compact 4", Optics Ready
- Won't fit Smith & Wesson M2.0 Full Size Recoil Spring Assembly This recoil spring is made for the Full Size slide; this build has the Compact slide.
Smith & Wesson M&P9 M2.0 Full Size 4.625" Threaded, Optics Ready
- Fits Smith & Wesson M2.0 Full Size Recoil Spring Assembly
Pistol and Magazine
How each magazine sits in each grip.
Smith & Wesson M&P9 M2.0 Full Size 4.25", Optics Ready
- Fits Smith & Wesson M&P9 M2.0 17-Round Magazine · Smith & Wesson M&P9 23-Round Magazine · Smith & Wesson M&P9 10-Round Magazine
- Check Smith & Wesson M&P9 M2.0 Compact 15-Round Magazine S&W lists the 15-round magazine for the Compact. In the Full Size grip it sits up inside the frame and is hard to strip out.
Smith & Wesson M&P9 M2.0 Compact 4", Optics Ready
- Fits Smith & Wesson M&P9 M2.0 Compact 15-Round Magazine
- Fits, with a note Smith & Wesson M&P9 M2.0 17-Round Magazine · Smith & Wesson M&P9 23-Round Magazine · Smith & Wesson M&P9 10-Round Magazine Full Size magazines work in the Compact and stick out below the grip.
Smith & Wesson M&P9 M2.0 Full Size 4.625" Threaded, Optics Ready
- Fits Smith & Wesson M&P9 M2.0 17-Round Magazine · Smith & Wesson M&P9 23-Round Magazine · Smith & Wesson M&P9 10-Round Magazine
- Check Smith & Wesson M&P9 M2.0 Compact 15-Round Magazine S&W lists the 15-round magazine for the Compact. In the Full Size grip it sits up inside the frame and is hard to strip out.
Parts Worth a Look
Our picks from the S&W M&P 2.0 catalog, with the lowest price we list (prices last checked Oct 5, 2026).
Upgrade Barrel
Smith & Wesson M2.0 4.625" Threaded Barrel
For the 4.25" slide · Threaded 1/2x28
$127.00 at Brownells (sample price)
Faxon M&P M2.0 Compact 4" Threaded Barrel
Compact · Threaded 1/2x28 · Match grade
$128.00 at Primary Arms (sample price)
Faxon M&P M2.0 Full Size Threaded Barrel
Full Size · Threaded 1/2x28 · Match grade
$131.00 at Primary Arms (sample price)
Magazine
Budget Pick
Smith & Wesson M&P9 M2.0 Compact 15-Round Magazine
15 rd · Compact flush
Flush with the Compact grip.
$42.00 at Primary Arms (sample price)
Best Value
Smith & Wesson M&P9 M2.0 17-Round Magazine
17 rd · Full Size flush
Flush with the Full Size grip; works in the Compact too.
$42.00 at Primary Arms (sample price)
Start from a Complete Build
Every part already checked to fit. Open one in the builder and swap anything you like.
Sources
Updated Oct 5, 2026.