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Site News GunTube Under Attack: The Smith & Wesson Lawsuit Expands
9/12/2026 3:21:16 PM EDT
hey guys quick question, I have a ris ii handguard I purchased and wanted to know if the geissel midlength heavy barrel would work with this build,
9/12/2026 4:09:47 PM EDT
[#1]
Gas journal size?
9/12/2026 4:25:41 PM EDT
[#2]
.750
9/12/2026 8:17:11 PM EDT
[#3]
The RIS 2 is cut for a carbine length gas system, so no that wouldn’t work.
9/12/2026 8:29:03 PM EDT
[#4]
Centurion has a quad rail that's cut for a mid length system

https://centurionarms.com/rail-systems/c4-rail-14in-front-sight-pocket-rail-handguard

Or you could buy a ris rail that's not cut and have it sent off to get a fsb cut done
9/12/2026 9:20:36 PM EDT
[#5]
FSB version or LPGB?

If LPGB, you can go with the RIS II M4A1 but you might have to remove the M203 Hangers from the inside of the rail system depending on the size of your gas block.

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