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3/9/2025 2:44:24 AM EDT
Friend of a friend looking for a dimension on a Knights SR-15. He’s making rails and needs to know the height above bore on the gas block to know if the rail will clear it and I guess is having problems getting an answer from anybody.

Appreciate any info you can provide in advance
3/9/2025 2:50:07 AM EDT
[Last Edit: redman797][Edited] [#1]
Very rough estimate with ruler. I’ll find my calipers. But in a mod 2 556, center of bore to top of gas block is about 2.5cm-3cm
3/9/2025 1:51:17 PM EDT
[#2]
@redman797

Thanks, I appreciate if you could get me an actual measurement as he has a contract pending if they fit or not.
3/9/2025 8:42:45 PM EDT
[#3]
Quote History
Originally Posted By Banshee35:
@redman797

Thanks, I appreciate if you could get me an actual measurement as he has a contract pending if they fit or not.
View Quote


And what type of “contract pending” does your friend of a friend have?
nothing is absolute
3/9/2025 11:46:28 PM EDT
[#4]
You’d think someone with money on the line would have the resources to figure this out.
3/9/2025 11:50:55 PM EDT
[#5]
Originally Posted By Banshee35:
Friend of a friend looking for a dimension on a Knights SR-15. He’s making rails and needs to know the height above bore on the gas block to know if the rail will clear it and I guess is having problems getting an answer from anybody.

Appreciate any info you can provide in advance
View Quote


Do his customers know the dimensions are coming from random dudes on the internet?

I’m assuming you’re asking about a Mod 2 gas system. My calipers tell me the distance from bore centerline to the underside of the top rail section is 1.04 inches.

Does your buddy have a SR-15 to live fire test his rails and make sure the gas block has enough room to whip?

There aren’t a ton of loose Mod 2 barrels/gas systems laying around. He should reach out to KAC or a shop that does KAC work such as D Wilson or NS Armory.
3/10/2025 11:53:26 AM EDT
[#6]
If he wants to make something people really want, make cloner rails for the SR25.
3/13/2025 8:17:59 AM EDT
[#7]
Quote History
Originally Posted By Apec:
If he wants to make something people really want, make cloner rails for the SR25.
View Quote


For real people would rip his hand off trying to give him money for urx 2 or 3.1 clone rails lol
3/13/2025 9:46:23 AM EDT
[#8]
Thanks for the replies. The question was posed to my friend because he owns plenty of stuff and then he asked me because I own a few things. Neither of us own an SR15 so I turned to you guys.

Thanks and I have forwarded a link to the thread to him

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