Bloop Tubes from Norm Houle

Nat'l Champ Makes Great Bloop Tubes

Houle Bloop Tube (Sight Extension) Gear Review by Robert Whitley
As a competitive shooter and a builder of custom AR-15 accuracy competition uppers, one of the frequent requests I have from shooters is for a recommendation for a good bloop tube. What people want is a bloop tube that is light and strong, one that has no detrimental effect on accuracy, one that works well with many of the existing front sights, and can be removed and re-attached quickly and easily with no loss of zero. For years finding a bloop tube that fulfills all these requirements has been a somewhat elusive exercise. I am pleased to report that I have found the Houle Bloop Tube to meet all my requirements. In my opinion, this is the best bloop tube on the market, by far. You can order a Houle tube from Norm’s Website, TopGunRI.com or e-mail Norm at topgunngh [at] verizon.net.


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Norm Houle High Power Bloop Tube
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Norm Houle High Power Bloop TubeBloop Tubes Designed by a National Champion
Norm Houle is a High Power and long-range shooter who has used these tubes to win National High Power Rifle Championships multiple times in past years. This past summer at Camp Perry, Norm’s bloop tubes were used by top “podium level” shooters in various events, including David Tubb, who won the National Long Range Championship using one of Norm’s tubes. Rodrigo Rosa also used Houle tubes this year to place second in the National High Power Rifle Championship and third in the Long Range National Championship.

Norm Houle High Power Bloop Tube

I have a couple of Norm Houle’s bloop tubes that I have used with a couple of rifle projects. Here are some of my thoughts on installation and use of the Houle Bloop Tubes:

  • Accuracy with the tubes in place is excellent!
  • The tube assemblies are two piece clamp-on tube assemblies, and the bloop tubes can be removed and re-attached with no loss of zero (and I mean no loss of zero). This is a big one! Over the years I have had quite a few clamp on tubes, but few of them repeated like these.
  • The tubes are very light but also very strong and low profile. Some of the clamp-on bloop tubes I have had over the years were huge, heavy and provided a large side profile (crosswind sail factor for offhand, etc.).
  • Norm offers 2″, 4″, and 6″ bloop tube lengths. The tubes are made to work with a .750″ dia. muzzle turn-down and both of the ones I have work perfectly with a minimum turn-down of 1.625″ long which provides enough “front-back” distance to permit the locating ring and bloop tube to be properly mounted on the barrel at the same time and work as they should. The tubes are also set up to use front sights which fit a .750″ diameter mounting.
  • Each tube assembly has a clamp-on locating ring plus a clamp-on bloop tube that positively indexes off a tapered pin that protrudes from the locating ring. The locating ring is light but very strong and absolutely stays put when you clamp it on the barrel end (clamps on with one screw using a common 7/64″ Allen wrench). The bloop tube part of the assembly has two clamp-on screws (use a common 7/64″ Allen to put on, mount and take off).

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Norm Houle High Power Bloop Tube

Using Different-Length Tubes for Different Applications
You can buy one tube with two or more locating rings and set multiple rifles up so you can move your bloop tube (with front sight attached) from rifle to rifle. You can also use two different bloop tubes to mate up with one locating ring on the same rifle. Norm uses a 2″ tube (with a front sight attached) for offhand and rapid sitting at 200 yards (short tube minimizes crosswind sail factor). For 300-yard rapid prone and 600-yard slow prone, Norm takes off the 2″ tube and mounts a 6″ tube on the rifle (with a front sight attached to it). Norm switches back and forth as needed from match to match (a 4″ tube is also offered). Norm noted that Rodrigo Rosa also used the same Houle bloop tube set-up with two different tubes this year at Perry to take second overall.

The price of a Houle bloop tube assembly with locating ring is $125.00. That’s more than some other brands, but a good value considering the design, features, and high-quality construction of Norm’s bloop tubes. Just as with all sights and optics… you get what you pay for.

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