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Posted: 3/10/2026 9:04:17 PM EDT
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Does anyone have a print of the Plan B mount or know where to see one? I may have to make my own as I want a 1.75" tube with 1.6875-20 thread and cant find one made. Was going to try Ecco, but no custom work right now |
| Try this company at worst they sell an extension that is the thread you want and a standard bravo thread. |
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Originally Posted By maggiethecat: Does anyone have a print of the Plan B mount or know where to see one? I may have to make my own as I want a 1.75" tube with 1.6875-20 thread and cant find one made. Was going to try Ecco, but no custom work right now |
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I've seen elsewhere the taper angle is 25 degrees inclusive, but that looks wrong to my eyes and my crude measuring comes close to 12 degrees. This seems to work for my stuff but... Also, ignore the external threads on that drawing, they were for a one of Project. The Plan B externals are 1.375-24 UNS |
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Originally Posted By blwngazkit: You're looking for the taper & thread dimensions to interface with the muzzle device? Taper dimensions. I know the thread is .9-24 It's an odd thread and I dont find it in fusion so I cant model it to have made. Hoping if i have the specs I can find someone to make it. I know I can use adapters, but would prefer single piece |
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Originally Posted By blwngazkit: This is what I drew up last time I made one. https://www.ar15.com/media/mediaFiles/168159/Untitled_png-3727532.JPG Thanks, I'll try 12 degree and see how that works in mock up |
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Originally Posted By blwngazkit: I just realized that drawing was for interfacing with a GRIFFIN muzzle device... Rearden's should be .9-24 threads and a 25 inclusive taper according to my notes. I'll look later today and see if I have a drawing for one of those as well. The Griffin taper angle was stated by Green0 to be 15 degrees inclusive. Form 1 makers a decade ago were using 16 degrees. Post 19 is by Green0 / Griffin https://www.ar15.com/forums/armory/Taper-Mounts--Xeno--Plan-B--Plan-A--Centrix--etc--and-Walking/20-532328/? Plan B / Rearden is 25 degree inclusive taper with 0.900” -24 tpi right hand thread. The length dimensions for various OD features vary by manufacturer. Whatever muzzle device is used can be used to reverse engineer the female mount. |
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Originally Posted By KalmanPhilter: The Griffin taper angle was stated by Green0 to be 15 degrees inclusive. Form 1 makers a decade ago were using 16 degrees. Post 19 is by Green0 / Griffin https://www.ar15.com/forums/armory/Taper-Mounts--Xeno--Plan-B--Plan-A--Centrix--etc--and-Walking/20-532328/? Plan B / Rearden is 25 degree inclusive taper with 0.900" -24 tpi right hand thread. The length dimensions for various OD features vary by manufacturer. Whatever muzzle device is used can be used to reverse engineer the female mount. Good to know! I measured it as 12 degrees, and that has worked for me to lock up, but I'll update my drawings for my future use. |
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Originally Posted By KalmanPhilter: The Griffin taper angle was stated by Green0 to be 15 degrees inclusive. Form 1 makers a decade ago were using 16 degrees. Post 19 is by Green0 / Griffin https://www.ar15.com/forums/armory/Taper-Mounts--Xeno--Plan-B--Plan-A--Centrix--etc--and-Walking/20-532328/? Plan B / Rearden is 25 degree inclusive taper with 0.900” -24 tpi right hand thread. The length dimensions for various OD features vary by manufacturer. Whatever muzzle device is used can be used to reverse engineer the female mount. thank you! I'm doing the female and the angle will be hardest to measure. This makes my life easier |
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