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Posted: 9/2/2004 6:24:30 PM EDT
| For installing a phantom FH what should I use a crush or peel washer? I purchased a peel washer with my FH without knowing any better. What is the diffrence between the two? Thanks. |
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Peel washer is a PITA. Peel, install, find out you are too big - peel some more, find out your are still too big - peel some more, find out you are still too big - peel some more, NOW YOU ARE TOO SMALL!!!! Crush washer - install and tighten FH to proper index point - done!! 
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I prefer a crush washer. I have spent a lot of extra time peeling away the layers of a peel washer to try to get a good fit and proper alignment of the A2 (closed bottom) flash hider. A crush washer simply flattens as the FH is turned, allowing a one-step installation. Alignment of the A1 type is probably less critical, but for aesthetics, a 12 o'clock alignment of the slits is probably desired. Perhaps someone can post pics to illustrate the difference. I have crush washer, but no peel washers. |
He's talking about the Phantom, not the Vortex. The Phantom comes in a version that has a closed bottom, so it requires indexing. The three I got from GTS came with crush washers. |
Is this usual for crush washers? Are there different torques for peel washer vs. crush washer? Does additional torque required to time a crush washer affect accuracy? Is there a ideal position for the flash hider bottom to be at when hand tight, before applying wrench torque? Flipping the crush washer around gives different hand-tight timing results. Washer one way, closed bottom of flash hider is at 12'0clock, when looking forward. Flipped around, closed end at 7 o'clock. Previous question: ar15.com/forums/topic.html?b=3&f=4&t=199875 |
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The crush washer is just turned until you have indexed the flash hider the way you want it. The washer continues to compress, so it doesn't really build torque. It takes a bit of effort to start the compression, but then it seems to turn on alright. I guess if you continued to tighten it until it crushed flat, it would then torque to 15 lbs
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I wouldn't. In two of those cases I was installing them on pencil barrels. They're too easy to bend. Cranking on an FS (above the 60 ft/lbs range) can lead to erratic accuracy. ETA, the concave portion of the crush washer goes toward the FS. |
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