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Build or buy a stripped 11.5 mk16 super duty upper/urgi

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Gonzaar24

Joined: Aug 2016

Posts: 1346

EE: 100% (25)

TX, USA

Posted: 1/18/2026 10:20:44 PM EDT

Hello i currently own an 11.5 upper that has a sionics barrel with the hodge spinelock. I love the durability but it's kinda beefy so I'm looking at the geissele mk16. I'm trying to offload the upper online. should I just swap out the rail with the geissele or get rid of the upper to fund for a geissele upper? Does the urgi mk16 and SD mk16 have the same lockup and durability?

-MainDisconnect-

@odgreenallthethings

Joined: Sep 2013

Posts: 2185

EE: 100% (41)

IL, USA

Posted: 1/18/2026 11:17:58 PM EDT

[#1]

The URGI will not have a tab to lock into the rail into the upper. The factory SD will have a tab.

I have a G built 10.3 URGI and and have no regrets.

Free men do not ask for permission.

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Build or buy a stripped 11.5 mk16 super duty upper/urgi

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Build or buy a stripped 11.5 mk16 super duty upper/urgi

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Build or buy a stripped 11.5 mk16 super duty upper/urgi