Well it depends what "much money" means to you.
It is a custom gun, but since you can get a lower receiver and built up from that...
It is an easy project to achieve.
I purchased the upper from CLE(http://www.compasslake.com/), than a lower from Wolverine, etc
It will cost you less than an HK or Sig, will be more accurate, but it is restricted
My next project will be an accurise AR-10, and I'll follow the same path.
Hopefully it will look something like this

It is a custom gun, but since you can get a lower receiver and built up from that...
It is an easy project to achieve.
I purchased the upper from CLE(http://www.compasslake.com/), than a lower from Wolverine, etc
It will cost you less than an HK or Sig, will be more accurate, but it is restricted
My next project will be an accurise AR-10, and I'll follow the same path.
Hopefully it will look something like this
