Black Rain NIBO BCG two types?

[notajeep]

When did Black Rain get a better BCG? No biggie just wondering.

 

[Firearrow]

Show the other end, I bet one is a Full auto carrier, and the other is a semi.

 

[notajeep]

They are both M-16 Heavy style. However the flat sided one came with a JP enhanced NIBO bolt.

 

[Firearrow]

We'll if memory serves me correct JP does make a full mass BCG that is triangular. But it has more material machined out on the side. Either way I bet it's a match BCG, and hopefully it works good for ya.