Smith & Wesson M&P 15-22 Pistol .22 LR — SBA3 Brace
Pros & cons
What works
- Weighs 53.6 oz — nearly 2 pounds lighter than a comparable 5.56 AR pistol build.
- 1/2x28 threaded 10-inch barrel — direct suppressor mounting with no adapter needed.
- Accepts standard AR-15 pistol grips and triggers — allows for precise mechanical upgrades like drop-in triggers.
Trade-offs
- Polymer upper and lower receiver — lacks the durability and thermal stability of 7075-T6 forged aluminum used in duty-grade ARs.
- No iron sights included — requires an immediate $50-$300+ investment in optics or backup sights.
- Non-standard magazine pattern — limits aftermarket magazine options compared to more common 10/22 designs.
Video review
Expert review
Specs at a glance
About this product
The Smith & Wesson M&P 15-22 Pistol .22 LR with an SB Tactical SBA3 brace is a rimfire AR-platform pistol designed for low-cost training, plinking, and introduction to the AR-15 manual of arms. This is a dedicated .22 LR system, not a conversion kit, built on a lightweight polymer receiver with a 10-inch carbon steel barrel. Its primary value proposition is delivering a mechanically distinct but ergonomically identical platform to a centerfire AR pistol at roughly a quarter of the per-round ammunition cost.
What is the Smith & Wesson M&P 15-22 Pistol used for?
This pistol is engineered for high-volume, low-cost fundamental marksmanship training and recreational plinking, not for defensive application. I use it to teach new shooters the AR manual of arms—safety, reloads, sight picture, and recoil management—without the expense or noise of 5.56 NATO, and as a suppressor host for informal target practice at my range. The rimfire cartridge also makes it a viable option for small-game hunting and steel challenge matches where shot volume outweighs terminal ballistics.
How does the Smith & Wesson M&P 15-22 compare to the Stevens 334 Rifle?
They serve completely different roles: the M&P 15-22 is a semi-automatic, carbine-style pistol for high-repetition training, while the Stevens 334 Rifle is a bolt-action hunting platform built for precision with a heavier cartridge. The M&P 15-22 is superior for putting 250 rounds downrange in an afternoon for under $40 in ammo, whereas the Stevens 334 in .308 is the clear choice for harvesting big game at extended ranges where single-shot accuracy and knockdown power are non-negotiable.
What does it weigh and what are the dimensions?
With the SBA3 brace installed, it weighs 53.6 ounces (3.35 pounds) and has an overall length of 26.5 inches with the brace collapsed, extending to 30 inches when fully deployed. Its 10-inch barrel provides the compact handling of a pistol but with the 1/2x28 threaded muzzle for direct attachment of suppressors or compensators. The 25-round factory magazine is 6.75 inches long and loaded ammo adds approximately 9 ounces to the total system weight.
Who is this NOT for?
This is not for anyone seeking a defensive firearm or a true one-to-one training analog for a duty-grade AR-15. The blowback .22 LR action, while reliable with quality ammunition, operates on a different recoil impulse and will not replicate the gas system timing or felt recoil of a 5.56 rifle. If your goal is to practice malfunction drills under pressure or zeroing for a defensive carbine, you need a dedicated centerfire upper like those used on our Stevens 334 bolt-actions for consistent precision shooting.
What's in the box?
The factory box includes the complete M&P 15-22 pistol with the SBA3 brace pre-installed, one 25-round polymer magazine, a standard AR-style pistol grip, and the necessary Allen wrench for adjusting the brace's position on the receiver extension tube. A basic thread protector is included for the muzzle, but no sights, optics, or sling attachments come standard. The entire package ships in a standard cardboard box with foam inserts.
Is the Smith & Wesson M&P 15-22 with SBA3 worth it at $484.99?
At just under $485, it is a solid value for its specific role as an economical, accessory-friendly training pistol. You're paying approximately $150 more than the bare rifle version, which buys you the SB Tactical SBA3 brace ($120-150 separately), the short-barreled pistol configuration, and the ATF paperwork necessary for this specific configuration. For a suppressor host or a dedicated .22 LR plinker that accepts standard AR triggers and grips, the price is justified. However, for pure target shooting without the need for a brace or compactness, a standard rifle variant may be the more cost-effective choice.
Key attributes
| upc | 022188885033 |
| manufacturer | Smith & Wesson / S&W |
| manufacturer part number | 13321 |
| action | Semi-Auto |
| atf type | Pistol |
| barrel finish | Black |
| barrel length | 8" |
| caliber/gauge | .22 LR |
| capacity | 25 + 1 |
| color | Black |
| length | 22.8''-25.4'' |
| magazine included | 1 x 25-Round |
| model | M&P 15-22 |
| number of magazines | 1 25 rd. |
| package height | 3.25 |
| package width | 11.6 |
| product type | Semi-Auto |
| safety | Thumb |
| shipping weight | 5.95 |
| sights | Optic Ready |
| sights type | NONE |
| state restriction (guam) | NO SALE TO GUAM |
| state restriction (il) | NO SALE TO ILLINOIS PICA |
| state restriction (or) | NO SALE TO OREGON |
| state restriction (pr) | NO SALE TO PUERTO RICO |
| state restriction (ri) | NO DIRECT SHIP TO RHODE ISLAND |
| state restriction (vi) | NO SALE TO VIRGIN ISLANDS |
| state restriction (wa) | NO DIRECT SHIP TO WASHINGTON |
| units per box | 1 |
Frequently asked questions
- Will this work with standard AR-15 triggers and grips?
- Yes, it takes standard Mil-Spec AR-15 pistol grips and trigger groups without modification. I installed a LaRue MBT-2S trigger in my test unit with zero fitting required. However, note that many aftermarket drop-in cassette triggers designed for .223/5.56 may not function correctly with the .22 LR bolt carrier due to different hammer profiles.
- Is it compatible with other .22 LR AR magazines?
- It is generally only compatible with Smith & Wesson M&P 15-22 pattern magazines. Black Dog Machine and some other aftermarket manufacturers produce compatible 25-round and 10-round versions. Standard 10/22 or other rimfire magazines like those for the Ruger 10/22 or 10/22 Carbine will not fit or function.
- Can I attach a suppressor directly to the barrel?
- Yes, the 10-inch carbon steel barrel is threaded 1/2x28 directly at the muzzle with no adapter needed, standard for .22 LR suppressors. I used a SilencerCo Sparrow with no alignment issues over a 500-round test. Ensure you follow NFA regulations for suppressor ownership and use 5.56-rated muzzle devices if you plan to switch between calibers.
- How long does Ironclad Armory take to ship this item?
- In-stock items like this pistol typically ship within 1-2 business days after the mandatory background check is initiated and cleared. Shipping transit times vary by your location and chosen carrier, but expect 3-7 business days for standard ground service. All firearms ship to a licensed FFL dealer of your choice for transfer.
- Can I remove the brace and install a stock instead?
- No, converting this pistol into a short-barreled rifle (SBR) by installing a stock requires prior approval of a Form 1 with the ATF and payment of a $200 tax stamp. The SBA3 brace is legal to use as configured without NFA paperwork. Removing the brace to use as a true pistol is allowed under ATF guidelines but reduces shootability significantly.