Brimstone Tier 2 Trigger

My current favorite 10/22 is the model 1149 Sporter which is featured on the cover of The 10/22 Companion. I use it as a test mule for parts to review, and in CMP Rimfire Sporter matches. A few weeks ago I bought a new, take-off trigger group on Ebay and sent it off to Brimstone Gunsmithing (brimstonegunsmithing.com) for a trigger job.

Brimstone is perhaps the best-known of the 10/22 specialist gunsmiths in the US. They offer three grades of trigger jobs:

  • Tier 3 (Basic) reworks the OEM trigger parts to make the movement as smooth as possible on both pull and reset, and lighten the pull weight to as little as 2 lbs. It also includes modifying the bolt lock to an auto-release. As of today, the price quote is $38.50 plus $9.50 return shipping.
  • Tier 2 (Intermediate) is much more extensive. The trigger blade is replaced with a Rimfire Technologies (or similar) trigger, which has a wide, flat surface that makes it hard not to press straight back. Also, the trigger return mechanism is replaced with a torsion-spring system, which is a major improvement. I’ll describe the system in more detail in a minute. Today it costs $73.50 plus shipping.
  • Tier 1 (Advanced) is the ultimate trigger job. In addition to the Tier 2 work, this adds an adjustable sear which removes nearly all of the pre-travel, or take-up, at the start of the trigger pull. Additionally, all parts of the trigger are “hot-rodded” with polishing, alignment, and other enhancements to make it the best it can be. Today it costs $110 plus shipping.

I opted for the Tier 2 job for this trigger. This one will be used specifically for Rimfire Sporter matches. The CMP rules require a minimum trigger pull weight of 3 lbs. That’s heavier than any of my other 10/22 triggers. Since the pull weight is so high, the little bit of take-up won’t even be noticed.

Here’s why the Brimstone Tier 2 trigger is so much better: The OEM Ruger trigger return uses a spring-loaded plunger in the rear of the trigger guard to push the trigger forward. It works fine, but there is friction as the plunger moves in its hole, and the resistance of the coil spring increases as you press the trigger. Brimstone’s system places a torsion spring on the left side of the trigger (similar to the bolt lock spring on the right of the trigger group), one leg of which is held against a set screw which is installed in the side of the housing. There is essentially no movement of the spring, so the reset is friction-free, light, and positive. Where the plunger and spring used to be, Brimstone installs a set-screw as an over-travel stop.

In the photos below I have not shown some of the work Brimstone does to the engagement surfaces, which are all modified to a degree. The details of that work are proprietary and I don’t want to reveal them.

Here’s how it looks from the outside. The set screw is to the right of the hammer pin:

TG showing set screw

This photo inside the trigger group shows the spring captured by set screw, just to the right of the front edge of the disconnector:

Showing position of torsion spring

This photo shows how the torsion spring fits onto the trigger blade:

Trigger assembly with torsion spring

While this trigger is heavier than I would like, it has to be in conformity with the CMP-RS rules. Aside from that, it is one of the best triggers I now own, thanks to the work done by Brimstone. The high quality, flat-faced, straight aluminum trigger blade is a huge improvement over the mushy feeling OEM plastic trigger. No, it isn’t a Kidd single-stage, because Kidd has its own proprietary sear/hammer geometry. It also isn’t $200.

I’m very happy with this trigger and recommend Brimstone’s work absolutely.

 

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