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Screw threads?
Can someone tell me what the thread is on the foregrip/vert ASA screws?
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Classic rail single screw is 1/4-20
Dual RT is 10-32 (IIRC)
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That's right. If you're using a 1/4-20 screw, it can't be a standard socket head screw from the hardware store. If so, the head will be too tall to fit between the body and rail. It needs to be a low-profile style socket head screw, which are never available at the hardware stores I frequent.
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Ace has the button-head ones (Chinese hat type). You'll need to grind down the sides of the head to fit the rail though. If you don't have access to a shop, easiest way to do it is with a hand drill and a file. Put the screw in the drill and grind the sides of the head down on the file till it fits the hole...or get with Tuna to get a proper one.
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Ok thanks guys that's a great help
I thought it was about a 1/4 but couldn't remember exact size
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The AM FG screw is called a "low head", you can get them here>>
http://www.mcmaster.com/#socket-head-cap-screws/=lky7ji
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