Accuracy Systems, Inc. Click for the BBB Business Review of this Guns & Gunsmiths in Byers CO

1661 Behrens RD
Byers, Colorado 80103
Tel: (303) 822-6849 Fax: (720) 367-5095
E-Mail Us at

Monday thru Thursday 9 AM to 4:30 PM Mountain Time Zone
Friday 8:30 AM to 12:30 PM Mountain Time Zone
(Closed Saturday & Sunday)

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Harmonic Barrel Stabilizer II Instructions

1) - The First Thing We Request. Do not try to rotate the Gas Pressure adjustment screw referred to from here on as the (G.P.A.S.) on the front of the gas block (Illustration #1). 2) - You must first install your gas bushing from your current Ruger factory gas block into the new gas block. 3) - The Stabilizer bar comes Pre-installed into the face of the gas block. The bar is 6061 Aluminum alloy so if you are ever going to remove the bar using a wrench make sure you take precautions to pad the wrench so you do not mar the finish. 4) - The front clamp works and looks best if it is positioned just behind the grove on the front of the Stabilizing bar (Illustration #2). Do use red Loctite on the two clamping screws if you do not want them coming loose.

Harmonic Barrel Stabilizer II Instructions Harmonic Barrel Stabilizer II Instructions

5) - When you receive the HBST II the Gas Pressure adjustment screws - set screw is tightened. Before making any adjustments you need to loosen the set screw. 6) - When you are completed making your adjustment snug tight the set screw so you do not damage the (G.P.A.S.)threads! If you apply too much pressure you will crush the threads on the (G.P.A.S.) and you may not be able to adjust it any more. There will be a cost for us to fix it of $20.00. 7) - When installing the bushing into your new gas block MAKE SURE that the gas bushing will drop all the way in and bottom out in the gas pipe recessed hole. 8) - If the gas bushing does not drop all the way in and seat into the recessed hole you will damage the gas pipe when you go tighten the gas block to the barrel. 9) - If the gas block will not sit flush on the barrel then you do not have the bushing seated correctly or the gas bushing is too long. If the bushing is too long it may have to be trimmed in length. ** When trimming the gas bushing please refer to our website PRODUCT INSTRUCTIONS Trimming gas bushings for Harmonic Barrel Stabilizer II, Adjustable Gas block & Non Gas blocks. 10) - Once the bushing is seated correctly and the gas block is installed onto the barrel it is time to test fire your rifle. 11) - The (G.P.A.S.) is pre-set fully open. DO NOT BACK IT OUT ANY FURTHER!! If the rifle is throwing the spent casings further than you would like you will need to start to close clockwise the (G.P.A.S.) one 16th turn at a time until you achieve your desired position. A little turn can make a big change so go slow. 12) - If you are not sure where full open should be because you have moved the (G.P.A.S.) during installation turn the (G.P.A.S.) clockwise till it stops, that is fully closed. When fully closed there is no gas delivered to the operating rod and the rifle will not cycle. 13) - At that point you can now slowly turn the (G.P.A.S.) counter clock wise a maximum of 3 full turns and no more, that will be fully open. If you do open the (G.P.A.S.) more than 3 turns you may lose the (G.P.A.S.) and the replacement cost is $20.00. 14) - Some rifles may require that the gas port hole be enlarged. The gas port is the hole in the barrel that the gas passes through into the gas block. It is very easy to do. Please call us and one of our qualified gunsmiths will walk you through the 2 minute process. This process is for the exception rifle that will not cycle.

Harmonic Barrel Stabilizer II Instructions Harmonic Barrel Stabilizer II Instructions
Harmonic Barrel Stabilizer II Instructions Harmonic Barrel Stabilizer II Instructions
Harmonic Barrel Stabilizer II Instructions
Picture of completed Install above.

Contact us at: Accuracy Systems, Inc. 1661 Behrens Rd. Byers, CO 80103
Phone 303.822.6849 or

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Revised 5/18/2015


Tuesday, October 25, 08:08:24 PM Mountain Time

Hours of operation are Monday thru Thursday 9 AM to 4:30 PM, Friday 8:30 AM to 12:30 PM Mountain Time Zone
(Closed Saturday & Sunday)

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