Rare Breech Cover Accessory!!!

[Fox Creek Kid]

I've never seen this before!! Scroll down to the third photo: http://www.gmartin-auctions.com/gma/catalogs/nov07_highlights.html

[Dusty Morningwood]

Seems like it wold screw up the sight line.

[Fox Creek Kid]

Uh, Dusty, it's for simply covering the port when NOT IN USE. 

[Dusty Morningwood]

Oh, so it's something else to have to keep track of.  Never mind.