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SERIES I STONING FIXTURE Reviews & Ratings

Save time and money by providing repeatable setup, accurate, measurable adjustments and suitability for many guns. The complete fixtures includes an adapter for the specific gun listed. Purchase more adapters separately for other guns; many jigs combined in one fixture! To use, mount hammer or trigger/sear on adapter, set and lock at correct index mark as instructed. Set stoning angle by counting “clicks” specified to raise or lower elevator and stoning guide. Lock guide, place stone on both roller and hammer or trigger/sear, and stone as normal. Easily adjustable to allow variations in stoning angle for exact, desired trigger pull weight. Same tool Ron Power uses in his own shop. Complete with one adapter and very detailed instructions written by Ron. You will also need a #10 Machinist’s Clamp and 6"x½"x½" stones.

SPECS: Steel, blued, precision ground and hardened. 5" (12.7cm) 4" (10cm) high, 3" (7.6cm) wide. Fixture includes 1 Adapter, hammer and sear clamp, three Allen wrenches and instructions. .154" Adapter fits AR-15/M16 with .154" dia. hammer and trigger pins. .173" Adapter fits Colt Commercial AR-15 only.

See all of our AR15s and AR15 parts here.

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Reviews Summary

The SERIES I STONING FIXTURE is well-regarded for its precision and ease of use, making it an essential tool for both novice and experienced gunsmiths. While some users faced initial setup issues, they quickly appreciated its repeatable results and customer support. The product is seen as a worthwhile investment, albeit on the pricier side. Users commend its build quality and versatility across different firearms.

What Reviewers Are Saying

Ease of Use

70%

Many reviewers highlight the simplicity of setting up and using the SERIES I STONING FIXTURE, noting that even novices can achieve successful results quickly. This ease of use greatly enhances the user experience, contributing to the tool's overall popularity.

Product Quality

75%

The quality of the stoning fixture is frequently praised, with users declaring it well-made, durable, and accurate. This contributes to the confidence users have while performing trigger jobs, ensuring sharp and clean trigger pulls.

Value for Money

60%

Despite its higher price point, numerous reviewers believe the SERIES I STONING FIXTURE offers good value due to its reliable performance and effectiveness. Users assert that this tool saves money in the long run by preventing damage to sears and other components.

Customer Service

50%

Reviewers consistently commend the excellent customer service provided by Power Custom, noting prompt assistance and replacement parts when needed. This proactive customer support significantly enhances user satisfaction.

Initial Setup Challenges

30%

While most reviews are positive, some users reported initial challenges during setup, such as misaligned index marks and needing minor adjustments. However, these instances did not deter overall appreciation for the quality of the fixture once properly configured.

Versatility and Compatibility

65%

Reviewers appreciate the fixture's versatility, as it can be adapted for use with various firearms. This compatibility with different models is frequently mentioned, making it a favorite among gunsmiths who work on multiple types of guns.

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Well designed, but with minor flaws

As received, one guide roller limit pin would not insert, had to ream its hole. The 45 adapter would not screw in place, had to chase the threads with a tap to remove burrs. The sear index pin, the one the sear slides onto, was slightly bent. And finally the "0" index mark on the 45 adapter was misaligned, off by 3/32". The slightly bent sear index pin is not that big a deal, as the pin is intended to simply locate the sear - the sear then is aligned by either using the suggested (but not included) modified machinist parallel clamp, or by using a longer screw to mount the adapter and then threading on a knob to hold the sear in place (I'll include an image). Note that while this knob makes it much more convenient to clamp and remove sear to flip it and stone relief angle (if desired), it cannot be used to hold the hammer as the longer fixture screw will be in the way, so for stoning the hammer hooks to length, either replace with original screw or use plan B. In any case, this jig isn't intended to do hammer hook faces. That misaligned index mark meant that the roller part of the fixture, instead of the suggested starting height of 20 clicks up, had to be all the way down to get a neutral primary sear angle. Think of the adapter index mark as a very course adjustment and the roller height as a fine adjustment - so the index mark *has* to be right. Yes, I understand that all of this is jibberish unless you have the fixture in front of you, but then hopefully it will make sense. The good news, the basic fixture is well machined and the angles that need to be 90 degrees all are that. Before mounting your adapter, Take a swipe or two with some fine sandpaper on a flat surface (surface plate etc) to remove any burrs that would prevent the adapter from mounting flush. Then use a machinist square on top of a stone or straight edge, with the ruler edge bisecting the sear index pin and the the sear tip at the apex of the square, and you can check the fixture adjustments for a starting neutral primary cut. Pic 2 shows a jig I made to check sear angle (instead of using machinist square) - either works fine and is only needed to check initial set up. Once set up, the jig is solid and repeatable.