![[Z-Parts] VIPER M4 PFAS Complete Bolt](http://www.sixmm.com/cdn/shop/files/1_d3f1e08b-3713-4786-9022-314134d50f66.jpg?v=1709874130&width=1200)
![[Z-Parts] VIPER M4 PFAS Complete Bolt](http://www.sixmm.com/cdn/shop/files/2_96dfce9b-b3bd-424f-a6c7-f5408a378a13.jpg?v=1709874131&width=1200)
![[Z-Parts] VIPER M4 PFAS Complete Bolt](http://www.sixmm.com/cdn/shop/files/3_18c0c2a7-fecd-4095-977b-6d432f89d9f8.jpg?v=1709874132&width=1200)
![[Z-Parts] VIPER M4 PFAS Complete Bolt](http://www.sixmm.com/cdn/shop/files/4_0f80ce4d-8f0a-40e8-baff-2e6984ed1993.jpg?v=1709874131&width=1200)
![[Z-Parts] VIPER M4 PFAS Complete Bolt](http://www.sixmm.com/cdn/shop/files/1_d3f1e08b-3713-4786-9022-314134d50f66.jpg?v=1709874130&width=450)
![[Z-Parts] VIPER M4 PFAS Complete Bolt](http://www.sixmm.com/cdn/shop/files/2_96dfce9b-b3bd-424f-a6c7-f5408a378a13.jpg?v=1709874131&width=450)
![[Z-Parts] VIPER M4 PFAS Complete Bolt](http://www.sixmm.com/cdn/shop/files/3_18c0c2a7-fecd-4095-977b-6d432f89d9f8.jpg?v=1709874132&width=450)
![[Z-Parts] VIPER M4 PFAS Complete Bolt](http://www.sixmm.com/cdn/shop/files/4_0f80ce4d-8f0a-40e8-baff-2e6984ed1993.jpg?v=1709874131&width=450)
![[Z-Parts] VIPER M4 PFAS Complete Bolt](http://www.sixmm.com/cdn/shop/files/1_d3f1e08b-3713-4786-9022-314134d50f66.jpg?v=1709874130&width=4096)
![[Z-Parts] VIPER M4 PFAS Complete Bolt](http://www.sixmm.com/cdn/shop/files/2_96dfce9b-b3bd-424f-a6c7-f5408a378a13.jpg?v=1709874131&width=4096)
![[Z-Parts] VIPER M4 PFAS Complete Bolt](http://www.sixmm.com/cdn/shop/files/3_18c0c2a7-fecd-4095-977b-6d432f89d9f8.jpg?v=1709874132&width=4096)
![[Z-Parts] VIPER M4 PFAS Complete Bolt](http://www.sixmm.com/cdn/shop/files/4_0f80ce4d-8f0a-40e8-baff-2e6984ed1993.jpg?v=1709874131&width=4096)
Got two of these from Sixmm. One went into a ASG M15 URX-SBR, the other into Specna Flex M4. Simple fit with no modifications required. Easy reroute of power cable to rear (channel part of gearbox) into PDW stock, Specna required a little extension to get to end of buffer tube. 1.14J on 90 PSI on 6.02 x 230mm barrel. 16 rps. Excellent, affordable, super quiet and responsive trigger.
The part is lightweight well made and comes with 2 buffers a good product for speed or for winter use
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.
