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 and we offer top-of-the-line gunsmithing services to ensure you get the pistol of your dreams.   If you want some aftermarket modifications, we have the expertise to complete them.  Buy a known product from a known gunsmith and you'll not only get exactly what you want, you'll also get the very best.

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