The SB Tactical SB PDW Adjustable Pistol Brace is a three-position stabilizing brace engineered for shooters building or upgrading short-barrel AR-15 pistols. Developed in collaboration with Maxim Defense, this brace delivers a modular platform that collapses, extends, or locks at mid-length to fit different shooting positions and storage needs. Whether you're running a home-defense setup, a truck gun, or a compact range toy, the adjustable design lets you dial in comfort and control without swapping hardware.
The complete assembly arrives ready to install on mil-spec AR-15 receivers and includes the proprietary buffer tube, a nylon strap with 1-inch width for a stable cheek weld, and everything needed for immediate use—you'll just need to source your own buffer and spring to match your rifle's bolt carrier group. The aluminum buffer tube houses an integral end plate and castle nut, so assembly is straightforward but requires care to avoid cross-threading during install or removal. A Quick Detach socket at the 6 o'clock position on the housing gives you options for mounting or sling attachment.
Built and designed in the USA by veterans, the SB PDW meets ATF compliance requirements for stabilizing brace use. The brace is compatible with standard mil-spec carbine buffers and springs, making it a drop-in option for most AR builds. Note that it does not fit Freedom Ordnance FX-9 lowers or SIG M400/516 receivers with integral QD sockets, so verify your receiver type before ordering.
At just over 18 ounces and adjustable from 6.75 inches (collapsed) to 9.375 inches (fully extended), the SB PDW keeps profiles compact while maintaining the rigidity and adjustability serious shooters expect. Black anodized finish resists corrosion in field use.
| Brand | SB Tactical (designed with Maxim Defense) |
| Product Type | Adjustable Pistol Stabilizing Brace |
| Fit | Mil-spec AR-15 receivers |
| Material | Aluminum buffer tube |
| Color | Black |
| Length (Collapsed) | 6.75 inches |
| Length (Mid-Position) | 8.125 inches |
| Length (Extended) | 9.375 inches |
| Maximum Width | 2.25 inches |
| Weight | 18.14 ounces |
| Strap Width | 1 inch |
| Rod Spacing | 1.175 inches |
| Tube Depth | 6.920 inches |
| Attachment | QD point at 6 o'clock position |
| What's Included | Complete assembly, adjustable nylon strap |
| What's Not Included | Buffer and spring (source separately to match your bolt carrier group) |
The SB PDW is designed for mil-spec AR-15 receivers. It is not compatible with Freedom Ordnance FX-9 lowers or SIG M400/516 receivers that have integral QD sockets. Verify your receiver type before ordering.
The SB PDW assembly includes the proprietary buffer tube but does not include the buffer or spring. You'll need to source a carbine buffer and spring that are mil-spec compatible with your specific bolt carrier group. Consult your rifle's manual or a gunsmith if you're unsure which weight is correct for your setup.
Yes, the SB PDW is designed and marketed as an ATF-compliant stabilizing brace. However, regulations and interpretations can change; we recommend checking current ATF guidance and your local laws before purchase and assembly.
The complete assembly is ready to install on a mil-spec AR-15 receiver. The end plate and castle nut are integral to the design. Take care during installation and removal, particularly when tightening or loosening the aluminum castle nut, to avoid cross-threading or damage. If you're unfamiliar with AR-15 assembly, we recommend consulting a qualified gunsmith.
Sellier & Bellot
