![[Z-Parts] Mk12 Mod1 Handguard & Steel Barrel for VIPER M4 GBB](http://www.sixmm.com/cdn/shop/products/viper-m4-008-01.jpg?v=1611818806&width=1200)
![[Z-Parts] Mk12 Mod1 Handguard & Steel Barrel for VIPER M4 GBB](http://www.sixmm.com/cdn/shop/products/viper-m4-008-02.jpg?v=1611818806&width=1200)
![[Z-Parts] Mk12 Mod1 Handguard & Steel Barrel for VIPER M4 GBB](http://www.sixmm.com/cdn/shop/products/viper-m4-008-03.jpg?v=1611818806&width=1200)
![[Z-Parts] Mk12 Mod1 Handguard & Steel Barrel for VIPER M4 GBB](http://www.sixmm.com/cdn/shop/products/viper-m4-008-01.jpg?v=1611818806&width=450)
![[Z-Parts] Mk12 Mod1 Handguard & Steel Barrel for VIPER M4 GBB](http://www.sixmm.com/cdn/shop/products/viper-m4-008-02.jpg?v=1611818806&width=450)
![[Z-Parts] Mk12 Mod1 Handguard & Steel Barrel for VIPER M4 GBB](http://www.sixmm.com/cdn/shop/products/viper-m4-008-03.jpg?v=1611818806&width=450)
![[Z-Parts] Mk12 Mod1 Handguard & Steel Barrel for VIPER M4 GBB](http://www.sixmm.com/cdn/shop/products/viper-m4-008-01.jpg?v=1611818806&width=4096)
![[Z-Parts] Mk12 Mod1 Handguard & Steel Barrel for VIPER M4 GBB](http://www.sixmm.com/cdn/shop/products/viper-m4-008-02.jpg?v=1611818806&width=4096)
![[Z-Parts] Mk12 Mod1 Handguard & Steel Barrel for VIPER M4 GBB](http://www.sixmm.com/cdn/shop/products/viper-m4-008-03.jpg?v=1611818806&width=4096)
Everything went together fantastically, no problems what so ever and the mounting system from my ris 2 locks up the ris 3 perfectly.
Fit and finish were perfect, no blems or anything, I'm currently trying to purchase the 9.5 inch ris 3 to build a mk18 ris 3, I'll definitely share once everything is together but right now get a look at the 12.5 ris 3. I Hope it does not disappoint.
It is build very solid and not going to break even if you try. However, you will have to remove all the ribs on inside the back side, and sand down the grabbing nub at bottom in order to put it on a NGRS mp5
I received this item faster the items I order locally. Part works great, I have no issues. Well worth the cost. I will continue to order them this site.