AR Quad Rails

Anything to do with rifle shooting, plinking, target, benchrest etc

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J
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AR Quad Rails

Post by J » Mon Jan 12, 2015 11:17 pm

Working on a new AR build and will be putting a FF 15" handguard. Ive been looking at the Midwest Industries T series or one of the Gen 2 versions. Anyone have any thoughts on MI? What brands do you think make the best FF handguards? Also, I need the inside diameter larger than 1.25. Thanks.

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J
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Post by J » Mon Mar 16, 2015 7:43 pm

So I went ahead and put on a MI Gen2 SS Series FF rail. For some reason the quad rail bows in the middle. It sits ALMOST flush with my upper receivers rail (barely noticeable). When I put it upside down on a flat surface, so its laying on the rail, you can see that its not totally flat. Is this normal? This is my first FF quad rail I put on.

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SR9
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Post by SR9 » Tue Mar 17, 2015 4:21 pm

I would say it is defective. The rail should be square on all sides, at leat the ones I have seen were.
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JohnB
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Post by JohnB » Tue Mar 17, 2015 7:54 pm

is it metal..alloy..etc or a polymer ?

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SR9
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Post by SR9 » Wed Mar 18, 2015 4:06 pm

JohnB wrote:is it metal..alloy..etc or a polymer ?
Its T6061 Aluminum.
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Post by JohnB » Wed Mar 18, 2015 10:09 pm

they say its CNC machined so it should be pretty close...how much off are you talking ? has to be some tolerance...did you try it with a real straight edge or another surface that should be flat ? that can give a false reading too

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