QUOTE (nezumi @ Apr 20 2010, 03:16 PM)

Alright. However, a shotgun can be reloaded like that right now, so assumedly this is an oversight of the rules and, to mirror realism, it should be permitted for a shotgun. To model realism, should it be permitted with the grenade launcher?
I don't see how the rules don't reflect this.
You're effectively turning a weapon with an internal magazine into a breach loading weapon by loading through the ejection port of a manually operated weapon in mid cycle. Since the weapon is SS rather than SA, I'd extrapolate that its' grenade launcher is manually charged, allowing for just the situation you describe.
Hell, as a smart weapon, I would imagine it has a mechanism that would allow you to open the bolt to extract the last round without feeding a fresh round from the magazine, which would allow you to tactical reload while you still have rounds in your internal magazine.
The other big downside to the loss in speed would be that you're turning a closed bolt weapon into an open bolt weapon, which means you get the risk of all sorts of crap winding up in the chamber while you're not firing.