Mod Guide Link: http://modworks.blogspot.com/2010/03/nerf-longshot-brass-breech-mod-guide.html
One of the issues with that brass breech design was that the brass barrel half-pipe prevents clips from being loaded when the breech is open, due to the width of the half-pipe.
From a modding suggestion by "phuonguyen" over at the OzNerf forum a while back, the idea of a thinner "quarter-pipe" for the brass barrel was hatched. Credit goes to phuonguyen for his idea.
So i made a brass barrel with the quarter-pipe design, and it worked perfectly!
Basically just cut a quarter-pipe into the brass barrel.
Then just install it into the Brass Breeched Longshot as per normal.
The above photo shows the brass barrel with quarter-pipe installed in a Longshot with the original angel breech bolt attachment design.
Note that if you are following my additional brass bolt half-pipe design, you'll also have to do the quarter-pipe technique on the brass bolt too, so that both parts will have quarter-pipes to line up nicely for clips to be loaded and unloaded properly.
Now you can load and unload clips when the brass breech is open! :)