Hey guys-

I tried searching for this but couldn't find exactly what I was looking for.

I'm trying to build a MCX upper and want to make sure I'm on the right track with the parts I need. So far I have a MCX Virtus upper with everything minus the barrel, recoil/bolt carrier assembly and piston.

I'm looking at purchasing a 5.5" Rattler .300 blk barrel. I know the Rattler barrel's aren't compatible with the Virtus recoil assembly as they come from the factory, but does anyone know if Sig sells a complete Rattler recoil/BCG assembly that would work with a Virtus upper and Rattler barrel?

If not, I'm happy to build the upper with the 6.75" .300 blk barrel but I can't find one in stock anywhere at the moment.

I'm going to give Sig a call on Monday and see what they say.

Thanks for any input.

This message has been edited. Last edited by: Flgorilla18,