I notched the polymer housing on the sides of the Kriss Vector barrel (photo attached is before notching) to get at least 0.050" clearance (MacMillan recommends this for proper free floating). I got my Form 1 approved for the Kriss Vector and chopped the CRB barrel down and took it to the range at 100 yd. I used CCI Blazer 9mm 115gr aluminum cased ammo, holosun 510C (open emitter LED sight, no mag), and an Armageddon Gear game changer bag to shoot these 5-shot groups. I have my initial grouping at 7..875" but all of them average out to about 5.3" - hardly a precision shooter but it wasn't my goal or expectation. I just wanted to see what it could do. I've seen magazine tests claiming <6MOA for the CRB and <12MOA for the SBR so my SBR matching/exceeding the CRB performance was respectable.
My Ruger PC Carbine (19122) is far more consistent and precise, averaging 2.94" 5-shot groups at the same distance with the same ammo and optics but it has a weird issue where the shots form a line followed by a flyer and I was able to reproduce it. Could be an issue with the barrel locking ring loosening, optic loosening, etc... I just cleaned/lubed everything so I'll be able to check it again soon.
The CCI ammo is basically decent practice ammo. The aluminum cases are rougher than brass, so with my factory Glock 33rd mags I run the Wolff XP springs for the past 15+ years.
My Ruger PC Carbine (19122) is far more consistent and precise, averaging 2.94" 5-shot groups at the same distance with the same ammo and optics but it has a weird issue where the shots form a line followed by a flyer and I was able to reproduce it. Could be an issue with the barrel locking ring loosening, optic loosening, etc... I just cleaned/lubed everything so I'll be able to check it again soon.
The CCI ammo is basically decent practice ammo. The aluminum cases are rougher than brass, so with my factory Glock 33rd mags I run the Wolff XP springs for the past 15+ years.
