STI Duty One

STI Duty One - Full size 1911 with tactical rail!

STI Duty One

STI Duty One

Retail $1,499.00
Brazos Price - $1,399.00


Designed for the most demanding duty, the Duty One pistol is built on STIís government size frame with integral tactical rail.  This tactical rail, milled into the dust cover of the frame, accepts all industry standard light mounts. The barrel is a 5.0"fully supported STI ramped bull barrel. The Duty One comes standard with a STI RecoilMaster guide rod system, commander style hammer, and patented STI International trigger system. The safety controls are STI's ambidextrous thumb safeties and high rise beavertail grip safety. The slide features include a lowered and flared ejection port, fixed rear sight, and front and rear cocking serrations.

Why purchase your STI from Brazos Custom?  Not only do we offer some of the best prices available, but we probably have exactly what you're looking for in stock.  We maintain a huge inventory of STI guns.  Need some expert information and advice on STI guns then we are your source.  We offer the best customer and technical support both before and after the sale to make sure you get the pistol that best meets your specific requirements. 

Duty One Specifications


.45 ACP, .40 S&W, 9◊19


STI 1911 Frame with Integral Tactical Rail, 30 LPI Front Strap Checkering, Undercut Trigger Guard




Classic, Flat Top with STI Front and Rear Cocking Serrations


STI Long Curved Trigger


5.01″ STI Bull barrel, Ramped, Fully Supported


STI High-Ride Beavertail Grip Safety; Ambidextrous Thumb Safety (Blued)

Guide Rod

STI RecoilMaster


STI Ramped Front; STI Fixed Rear

Overall Length

8.5 inches


32 oz


Blued Matte Finish

Magazine Comes with one magazine:
- 9mm/38 Super holds 9 plus 1
- 40 S&W holds 8 plus 1
- 45 ACP holds 8 plus 1
Competition Approvals Pending

If you don't mind waiting, we can place an STI build order to make sure you get exactly what you're looking for.  Your pistol can be customized by adding the following STI options:

STI Build Order Options


Hard chrome


STI fixed, tritium sights (2 dot)


1911 parts at Brazos Custom