Question about diameter of gas blocks and internal diameter of hand guards

Diameter means a circle. Is the valley a circle? No. The ID of the rail, meaning the circular portion, may well be 1.37, but the height is substantially more.

And that's why I ask. They don't exactly give you all the measurements.

Appreciate the help. Do you know if the valley height is roughly the same for most handguard, and what the height is? Thanks
 
And that's why I ask. They don't exactly give you all the measurements.

Appreciate the help. Do you know if the valley height is roughly the same for most handguard, and what the height is? Thanks

Since they mate up with the upper receiver like all other rails do, I am going to assume they have the same height and width of most other gas tube/gas block valleys on all other rails.

As you can see in this picture the height of the gas block isn't even that much of an issue because the gas tube actually sits higher then the gas block as it bends upwards as it goes into the receiver. Above the gas block itself there is still tons of room in the valley. When they remove the picatinny rail sections it does not affect the inner dimensions, they simply mill off the picatinny sections for a smoother feel and look. They don't go deeper into the valley or change the inner dimensions

Fortis-Mfg-Night-Rail-2.jpg


I don't think you would have an issue with gas blocks fitting, the biggest problem I see with adjustable gas blocks is where the adjustment screw is located. On the side may not line up with the cutouts in the rail, requiring rail removal to adjust the gas. I would prefer the SLR rifleworks style where the adjustment screw faces forward allowing you to adjust from the front with a long tool without removing the rail

Inner diameter is usually only an issue when trying to fit a muzzle device partially insides the rail

8563-5.jpg


Tons of room on the height and easily adjustable from the front, also everything Ive bought from SLR is great quality and fit/finish
slr-adjustable-gas-block.jpg
 
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Since they mate up with the upper receiver like all other rails do, I am going to assume they have the same height and width of most other gas tube/gas block valleys on all other rails.

As you can see in this picture the height of the gas block isn't even that much of an issue because the gas tube actually sits higher then the gas block as it bends upwards as it goes into the receiver. Above the gas block itself there is still tons of room in the valley. When they remove the picatinny rail sections it does not affect the inner dimensions, they simply mill off the picatinny sections for a smoother feel and look. They don't go deeper into the valley or change the inner dimensions

Fortis-Mfg-Night-Rail-2.jpg


I don't think you would have an issue with gas blocks fitting, the biggest problem I see with adjustable gas blocks is where the adjustment screw is located. On the side may not line up with the cutouts in the rail, requiring rail removal to adjust the gas. I would prefer the SLR rifleworks style where the adjustment screw faces forward allowing you to adjust from the front with a long tool without removing the rail

Inner diameter is usually only an issue when trying to fit a muzzle device partially insides the rail

8563-5.jpg


Tons of room on the height and easily adjustable from the front, also everything Ive bought from SLR is great quality and fit/finish
slr-adjustable-gas-block.jpg

That's perfect, thanks for the help. It's my first rifle build so wanted to make sure everything fits before I start ordering.

Really appreciate it!
 
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