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Posted: 9/10/2025 8:36:20 PM EDT
| I've put this into a CMMG Banshee 9mm. Installed just fine. Function test with the upper on it has the safety working fine. Semi auto works fine. However, in Super Safe mode, the bolt goes back and remains stuck in the receiver extension. I have to remove the front push pin and wiggle the receiver up and down, and then the bolt closes. I can put the front push pin back in place and it will work on super safe for one shot, ,and then the bolt gets hung up again. Thoughts? |
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Per the AS Designs Troubleshooting Guide: https://activesafetydesigns.com/troubleshooting/ Issue: The charging handle or bolt carrier group “binds” or “sticks” about ¾ of the way to the rear. Solution 1: The rear shelf of the upper needs to be cut to prevent the lever from being pinched between it and the BCG (Bolt Carrier Group). Please see Pictures 2 and 3 below for before and after examples of the shelf cut. You may use a Dremel to quickly remove this. Solution 2: This solution should not be needed if the aforementioned upper cut is performed, we do not recommend this solution in 99% of installations. The flat “top” of the lever is too tall and needs to be ground down some to prevent binding between the BCG and cam. If it is still necessary, use a Dremel with a drum sander (40-80 grit) to grind the top of the lever some until it functions smoothly. Note: We will not cover any failures of the lever resulting from this modification. Solution 3: If the bolt is over-traveling too far into the buffer tube, you either need a longer buffer (rifle length buffer) or you may place 1-4 quarters in the rear of the buffer tube behind the spring to “shorten” the tube (not our recommended solution, but it has worked).   I recommend you read the other trouble shooting tips. Also make sure you are using a low shelf lower receiver. |
| Try dropping quarters down the buffer tube, behind the spring. Or equivalent sized washers, if you want to retain the drain hole. It's the easiest and cheapest attempted fix, and most reversible, and it's worked to get two of my Super Safeties running perfectly without grinding anything. |
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Send GMR an email and he will send you a trouble shooting guide. In my case I added 3 quarters to the buffer tube and works great. Basically the bolt had too much over travel causing binding. Another option was explained above cutting the upper a bit. Lastly check your lower put a 1/8" drill bit under the lever it should be able to touch it if it doesn't the shelf in the lower needs to be cut back. This is a tolerance stacking issue I had two drop in work perfect the third did not. |
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Quarters are for laundry machines and vending machines. OP.....the binding is from the lever binding against the BCG. 1st.....pull out the quarters from the buffer tube. Then verify the lever is free to travel it's entire arc, and not hitting the shelf behind the safety hole. Some 9mm BCG's need to have a small pocket for the lever to fit in the BCG as it grabs the lever going forward, and the lever is in its rear arc position. Usually the weight can be removed from the 9mm BCG and a relief area can be ground on the weight. Then reinstall it into the 9MM BCG. I just mill it, but a grinder or cut-off wheel will also work This may not be an issue with the CMMG rotating bolt. Here's another way to determine what's going on.... pull off the upper, use some marking fluid or a red or green sharpie marker on the bottom of the BCG along the path the lever will be touching. Now re-install the BCG, and go through your function checks operating the BCG manually with the charging handle. If it sticks, put a piece of soft wood or an old shoe on the floor. Hold the muzzle of the gun above the wood/shoe about 6" or so, and let it drop. it should allow the BCG to release and go to its forward position. It's the opposite of mortaring a rifle. Now pull the upper off, and inspect the lever. See if the marker color is left behind on the lever. If it's on the lever, you need to clearence the lever where the color is by slightly grinding that area. If you have a caliper, this part at the end of the lever should measure .120 thick. grind off a little (like .010), polish it out, and try the function check again. Also, when you are doing the function check, hold the gun with the barrel pointed straight down. Gravity will keep the lever riding in the BCG properly.  PCC Bolt Mod for #supersafety #pcc #9mm #ar9 #9x19 #bolt  AR9 Super Safety layout | How I got it to function correctly . |
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Quoted: Quarters are for laundry machines and vending machines. OP.....the binding is from the lever binding against the BCG. 1st.....pull out the quarters from the buffer tube. Then verify the lever is free to travel it's entire arc, and not hitting the shelf behind the safety hole. Some 9mm BCG's need to have a small pocket for the lever to fit in the BCG as it grabs the lever going forward, and the lever is in its rear arc position. Usually the weight can be removed from the 9mm BCG and a relief area can be ground on the weight. Then reinstall it into the 9MM BCG. I just mill it, but a grinder or cut-off wheel will also work This may not be an issue with the CMMG rotating bolt. Here's another way to determine what's going on.... pull off the upper, use some marking fluid or a red or green sharpie marker on the bottom of the BCG along the path the lever will be touching. Now re-install the BCG, and go through your function checks operating the BCG manually with the charging handle. If it sticks, put a piece of soft wood or an old shoe on the floor. Hold the muzzle of the gun above the wood/shoe about 6" or so, and let it drop. it should allow the BCG to release and go to its forward position. It's the opposite of mortaring a rifle. Now pull the upper off, and inspect the lever. See if the marker color is left behind on the lever. If it's on the lever, you need to clearence the lever where the color is by slightly grinding that area. If you have a caliper, this part at the end of the lever should measure .120 thick. grind off a little (like .010), polish it out, and try the function check again. Also, when you are doing the function check, hold the gun with the barrel pointed straight down. Gravity will keep the lever riding in the BCG properly.  https://www.youtube.com/watch?v=sFAKi4wZYxA https://www.youtube.com/watch?v=hCmzQxZflEE. Respectfully, why on Earth would you mill parts on your gun when the problem can be solved quickly, easily, and with no permanent modifications? |
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Quoted: Respectfully, why on Earth would you mill parts on your gun when the problem can be solved quickly, easily, and with no permanent modifications? Tnis post tells me you didn't watch the 2 videos which explains all this. Because it is a FACT that some 9mm bolts need the shelf/relief cut where the weight protrudes into the cavity that the lever and hammer ride in. Doing this eliminates the need to shorten the stroke and arc of travel for the lever using the band-aid solution of stacking loose change in a buffer. In other words....it's the right way to fix the issue. |
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