Wolverine 7.62 x 39 mm Flash Hider Reviews?

Does anyone here still use, or have any experience with the Venom Tactical Wolverine Flash Hider?

http://venomtactical.com/products/wolverine-flash-hider-long-1-2x28-fluted-pointed

I found nothing on this forum, and the only other links I found with anything related to it were from a not so reliable source.

I see this version is 3.75" long; they also say there is the blunt version available. I would like the non-pointed end version, but does anyone know what the over all length of it would be?

Can anyone comment on how effective it is with reducing flash compared to a Surefire or Vortex?

I need about 3.25" to meet non NFA requirements, so there isn’t much out there. This would be for a 7.62 x 39 mm AK.

Thanks

I use the short spiked version and I haven’t noticed any flash during the day or at night in training.