STI Duty One

STI Duty One - 1911 with tactical rail!

STI Duty One

STI Duty One

Discontinued/No longer available

Model MSRP Everyday
Brazos Price
On Sale
Duty One:  4" and 5" in 45 ACP $1,499 $1,399 $999


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


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″/3.24"  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 (5" gun); 6.5" (3" gun)


32 oz (5" gun); 31.6 oz (3" gun)


Blued Matte Finish

Magazine Comes with one magazine:
- 3" gun:  9mm Officer holds 8 plus 1
5" gun:  45 ACP Gov holds 8 plus 1

1911 parts at Brazos Custom