The PWS Pistol Buffer Tube has a nominal outer diameter of 1.2 inches.
Understanding Buffer Tube Dimensions
The outer diameter (OD) of a firearm's buffer tube is a critical dimension that determines compatibility with various stocks, braces, and other accessories. Different manufacturers and firearm platforms may utilize unique buffer tube specifications, and understanding these differences is essential for proper assembly and function.
PWS Pistol Buffer Tube Specifics
The PWS Pistol Buffer Tube is specifically designed for AR pistol builds. Its nominal outer diameter of 1.2 inches sets it apart from standard carbine buffer tubes. This particular dimension is engineered to work seamlessly with Pistol Stabilizing Braces (PSBs) and other components intended for compact, non-stock configurations typically found on AR pistols. The design often emphasizes a clean, minimalist profile suitable for fixed or brace-only setups.
Comparing to Standard AR-15 Buffer Tubes
While the PWS Pistol Buffer Tube features a distinct 1.2-inch OD, the most common AR-15 carbine buffer tubes adhere to one of two primary standards:
- Mil-Spec (Military Specification): These buffer tubes typically have a nominal outer diameter of approximately 1.148 to 1.150 inches. They are characterized by a slightly smaller, consistent diameter along their length and a flat-back design. Mil-spec stocks are designed to fit snugly on these tubes.
- Commercial-Spec: Commercial-spec buffer tubes are slightly larger, with a nominal outer diameter usually around 1.168 to 1.170 inches. They often feature a noticeably angled or sloped rear end. Commercial-spec stocks are designed to accommodate this larger diameter.
The PWS Pistol Buffer Tube's 1.2-inch dimension is larger than both mil-spec and commercial-spec carbine buffer tubes, highlighting its specialized purpose for pistol applications rather than traditional adjustable rifle stocks. For more details on standard AR-15 buffer tube specifications, you can explore resources like Brownells' guide on Mil-Spec vs. Commercial-Spec Buffer Tubes.
Key Differences in Buffer Tube Types
To illustrate the dimensional variations, here's a comparison of common buffer tube types:
| Buffer Tube Type | Nominal Outer Diameter (OD) | Primary Application |
|---|---|---|
| PWS Pistol Buffer Tube | 1.2 inches | AR Pistol builds, Stabilizing Braces |
| Mil-Spec Carbine Buffer Tube | Approx. 1.148 - 1.150 inches | AR-15/M4 Carbines, Mil-Spec adjustable stocks |
| Commercial-Spec Carbine Buffer Tube | Approx. 1.168 - 1.170 inches | AR-15 Carbines, Commercial-Spec adjustable stocks |
Importance of Correct Fitment
Selecting the correct buffer tube is paramount for safety, function, and compatibility.
- An incorrect outer diameter will prevent the proper installation of a stock or brace, leading to poor fitment or complete incompatibility.
- Using a stock designed for a larger tube on a smaller tube can result in excessive wobble, while forcing a smaller stock onto a larger tube is impossible or can cause damage.
- Beyond external dimensions, buffer tubes also vary in internal diameter and length, which affects the type of buffer and spring that can be used.
