Why Choose the Mitchell Defense .308 12.5" Pistol
• Compact .308 Platform – Delivers the power of .308 Winchester in a reduced overall footprint.
• 12.5" Balanced Configuration – Optimizes maneuverability while maintaining strong ballistic performance.
• SBA5 Pistol Brace – Helps stabilize the firearm during one-handed operation by attaching to the user’s forearm, providing additional support and control.
• Precision Ground MD10 BCG – Reduced friction and improved reliability for long-term performance.
• A5 Length Buffer System – Smoother recoil impulse and consistent cycling.
• Adjustable Gas System – Allows tuning for ammunition types and suppressed use.
Built for Hard Use
The Mitchell Defense .308 12.5" Pistol is engineered to deliver reliable performance in a compact large-frame configuration.
Precision Ground MD10 Bolt Carrier Group
The MD10 BCG is machined and precision ground to achieve a near frictionless surface across both external and internal dimensions. Treated with Blacknitride+™, it delivers durability, corrosion resistance, and consistent operation.
Billet Upper and Lower Receivers
Machined from 7075-T6 aluminum, both receivers are precision machined, hand finished, and hard coat anodized to ensure strength, durability, and proper fit.
Thermal Fit Barrel Interface
The thermal fit upper receiver provides a rigid barrel interface, improving alignment and overall consistency.
A5 Buffer System with Flatwire Spring
The A5 length buffer system paired with a proprietary flatwire AR10 spring and heavy buffer helps reduce recoil impulse and maintain reliable cycling.
Adjustable Gas System
The adjustable gas system allows the platform to be tuned for different ammunition types and suppressed configurations.
Compact Platform Design
The 12.5" configuration provides a reduced overall footprint while maintaining the capability expected from a .308 platform.
Why Choose a 12.5" .308 Pistol?
The 12.5" configuration offers a balance between compact size and performance within the .308 platform.
Compared to longer barrel configurations such as 16" or 20", the 12.5" platform provides a shorter overall length, improving handling and portability.
While velocity is reduced compared to longer barrels, the .308 cartridge retains significant energy even at shorter barrel lengths.
For shooters looking for a compact large-frame platform that maintains capability, the 12.5" configuration provides a strong balance.
.308 Velocity and Performance
The .308 Winchester cartridge maintains usable performance across a range of barrel lengths, with velocity increasing as barrel length increases.
| Barrel Length |
Approx. Velocity (.308) |
Performance Notes |
| 12.5" |
~2,200–2,400 fps |
Compact platform with strong retained energy |
| 16" |
~2,500–2,650 fps |
Balanced performance and portability |
| 18" |
~2,600–2,750 fps |
Improved velocity and consistency |
| 20" |
~2,700–2,850 fps |
Maximum velocity and long-range performance |
Even in shorter barrels, .308 maintains significant energy, making it effective in compact configurations.
Choosing the Right Barrel Length (.308)
Barrel length affects overall performance, recoil characteristics, and handling.
Rifle & Pistol Barrel Length Comparison by Use Case
| Use Case |
Recommended Barrel Length |
Why It Works |
| Compact Large-Frame Platform |
12.5" .308 SBR / Pistol |
Maximum compactness with full-power cartridge |
| General Purpose Rifle |
16" .308 Rifle |
Balanced size and performance |
| Precision / Extended Range |
18–20" .308 Rifle |
Increased velocity and stability |
