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firearms and training blog

AR15 Gas Impingement vs. Piston

10/31/2014

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Some say the gas impingement operating system is like a person who poops on the same table they eat from. But is that really fair? Here are Richard Mann’s 6 factual observations in the AR-15 gas impingement vs. piston debate.With the gas impingement system, gas is diverted from the barrel through a tube and back into the upper receiver to operate the action. 
As someone who tests and reviews guns for a variety of firearms periodicals, I’ve had the opportunity to test versions of both the gas impingement and piston-driven ARs. Here are my factual discoveries:

1. Piston-driven guns run much cleaner. Fire a 30-round magazine through a piston-driven AR and it will look just as clean afterwards as it did before you fired it.

2. Piston-driven guns run much cooler. You’ll have to shoot about 100 rounds through a piston gun and a gas gun to really feel the difference, but it is there.

3. On average, piston-driven guns are less accurate. This does not mean piston-driven ARs are inaccurate, but, looking over my test records, the most accurate ARs I’ve tested have been those that work with the gas impingement system.

4. On average, piston-driven guns cost more. This observation must be qualified with “it depends.” There are some very expensive gas impingement ARs and some piston-driven ARs that are not all that expensive. However, if you want to purchase the least expensive AR possible, it will be a gas impingement gun.

With the gas piston system, gas is funneled from the barrel to drive a piston that works the action.

5. If you intend to run a suppressor on your AR, it has been my experience that the gas impingement guns are more suppressor-friendly, especially those with an adjustable gas block that allows you to control the amount of gas directed back through the gas tube.

6. Both piston-driven and gas impingement guns are very reliable. If, by magic, you inserted me in the pages of Bryce Towsley’s book The 14th Reinstated and I had to live through a social and economic collapse where there were roving bands of marauders, and if you told me I had to pick between a gas impingement or a piston-driven AR, I really would not care which one I ended up with. Except for three things: parts for gas impingement ARs are easier to find, much more plentiful, and less expensive.

Now, here’s the good news. The unmatched modularity of the AR allows you to, in a way, have your cake and eat it, too. If you own a gas impingement AR and want to try a piston-driven AR, just purchase a piston-driven upper receiver. Since the gas impingement and piston systems work independently of the lower receiver, you can alternate between both on the same lower receiver.

This article is an excerpt from the Gun Digest Shooter’s Guide to the AR-15.

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Effective Defensive Firearm Training

10/28/2014

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PictureJim Benoit of Tuscarora Tactical teaching pistol class
We have been busy out on the range instructing new students with the level one curriculum of Defensive Carry at Northern Chester County Sportsmen's Club in southeast PA. In December we step it up with the Level 2 class! 
Not everyone is ready to move to level 2 that participates in a level 1 class. 
Here are some tips for training at home to ensure you can move up in a class level with your defensive training at a pace that stays exciting.
  1. Dry Fire - check your pistol is clear, then check it two more times! No ammo in the room either. Then, practice your draw, grip, stance and sight picture over and over. 10 minutes at a time is plenty
  2. Mag Changes - check your pistol and mags are clear, then check them two more times! No ammo in the room either. From your compressed ready position or #3, remove your mag, tap it on your belt or pocket, reinsert the mag, indexing the magazine properly into the gun. Repeat 50 times with out looking at your sidearm!

More coming soon...

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Defensive Pistol Training in West Chester, PA

10/24/2014

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Picture
Starting November 19, 2014, we will be holding two weekly classes for defensive pistol at McCormick Karate using the SIRT Laser pistols.

The 7:45 pm class will be an intro class for new students and a refresher for existing students. All of the basic foundations of grip, draw and stance will be covered. 

The 8:45 pm class will cover advanced techniques including teamwork, work in the dark, home strategies, as well as Israeli style techniques. We will also introduce stress and cardio! Contact us to sign up. Buy a block of 10 classes for $200 or by the session for $25.

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CAJUN ARMS & TUSCARORA TACTICAL TRAINING
WEST CHESTER, THOMPSONTOWN, PA
USA
610-399-1188
benoit@cajunarms.com