Bullpup Design: Why must the hammer be behind the magazine?

[Cableaddict]

We need little periscopes for our scopes. Adjustable for eye to cheek height. Head tilt, etc. 

Just dreaming...... 

Dave

I've actually asked several scope manufacturers why they don't do that. - Especially with prismatic scopes. 

In the near future, I expect we'll see a ton of scope that mount right on the barrel, and have a mini camera with a raised LCD at the objective end.   We're practically there now if you mount a smart phone.  The next step will be heads-up display shooting glasses.