ASG STI Duty One CO2 Blowback Steel BB gun

Out of Stock
$ 79.95

Total: $79.95

Type: BB air pistol
Manufacturer: ASG
Model:  ASG STI Duty One 1911 Blowback
Materials: Metal slide and polymer frame
Weight: 1.8 pounds
Barrel: Metal non-rifled
Propulsion: CO2 x 1
Action: Semi auto blowback, single action
Ammunition Type: 4.5mm BBs
Ammunition Capacity: 20 round magazine
FPS: 383

Buy the magazine: ASG16731

Trigger Pull: The trigger pull on the ASG STI Duty One 1911 is nice and light due to its true blowback operation that cocks the hammer back with each shot taken. The pull is rather long but nothing really happens until you get right to the end and then there is just a slight bit of pressure and a quick release.

Accuracy: I shot the STI Duty One 1911 air gun at a target from 20 feet away in a free standing position, and it performed well getting a 1.5 to 2 inch grouping right in the center of the target. The rear sight is adjustable for windage which is always nice to have just in case you are shooting a bit to the left or right. For me there was no need to adjust the sights. My Chrony testing with an eight shot averaged result was 373 fps - very decent for a blowback pistol!

Build Quality: ASG did an awesome job designing and making the STI Duty One 1911 Blowback BB gun. They didn't really compromise on anything other than the polymer frame! With that said all that important parts like the Slide, Slide Catch, Safety, Mag Release, Hammer, Barrel and Magazine are all metal. The fit and finish as with all the ASG air guns is excellent!

Realism: The ASG STI Duty One 1911 Blowback is a really close replica to the real steel STI 1911. The only real giveaway is the trigger design as a true 1911 trigger is not your typical lever type. Even with the different type of trigger the STI Duty One is a very good replica complete with all the STI licensing and trademarks.


  • Realistic true blowback action.
  • Adjustable rear sight for windage.
  • True single action blowback gun.
  • Excellent quality control. Very well made, fit and finish is excellent
  • Good power, accuracy, and CO2 efficiency for a blowback gun.
  • Metal dropout magazine.
  • Good STI Replica.
  • Extremely enjoyable gun to shoot!


  • Trigger is not true to the real 1911 style.
  • Has a polymer frame, not metal.
  • I found the CO2 kind of hard to get out.

Comments: I am quickly realizing that ASG is a company that makes not only some really nice air pistols, but also ones with excellent quality control and design. The STI Duty One 1911 Blowback CO2 BB gun is no exception to this and I found it a blast to shoot because it felt great in the hand, shot hard and on target, performed flawlessly and I was able to get a lot of shots from a CO2 even with the blowback and high fps for a blowback shooter. If you're a 1911 fan or you simply like full size guns that mean business, then take a look at the ASG STI Duty One 1911 Blowback CO2 BB pistol. If I had to pick one BB shooter to take out for a day of plinking, this would probably be the one!

Caliber:4.5 mm (.177 cal)
GunBarrelLength:11.6 cm (4.55 inch)
FPS:350 to 400
Ammo Type:Steel BB
Power Source:Co2
Rail Type:Weaver
Trigger Action:Double
Body Type:1911
Blowback Action:Blowback
Front Sight:Blade
Rear Sight:Fixed

Have you used this product?
Rate it now.

ASG STI Duty One 1911 Blowback CO2 BB Gun Review

ASG STI Duty One 1911 Blowback CO2 BB Gun Review

(1273 raters) 356235 views - 5/22/2011 9:08:24 PM - ASG STI Duty One 1911 Blowback CO2 BB Gun Review.

-CO2 Powered
-4.5mm Steel BB
-20 Round Metal Magazine
-STI Duty One 1911 Replica
-Semi Auto - Single Action
-Blowback Action
-383 FPS
-Purchased from

This video is a walkthrough review of the ASG STI Duty One 1911 Blowback CO2 BB Pistol. I show off the gun close up from all angles and point out the metal and polymer components and the excellent quality and features this airgun offers . I also show you a target that I did an 8 shot accuracy test from 20 feet out in a free standing position along with the results of my Chronograph 8 shot test. - very impressive!

This is a very realistic and fun full sized air gun to shoot, it offers just about everything you can ask from a replica airgun including, true blowback action, nice high fps, decent CO2 usage, accuracy and excellent quality. If I had to pick one gun to take out for a day of plinking, this would probably be the one!

Buy this gun from the Canada Replica Airguns Store:

Buy this gun from the US Replica Airguns Store:

Check out the full review on my website at:

How are we doing? Give us feedback about this page.