It seems these days we can add a third certainty. In addition to death and taxes, the price of ammo going up is a fairly certain event. For those that handload to circumvent the high price, keeping and maintaining high quality brass is tantamount. Of course, one of the best ways to accomplish this is to collect your once-fired brass at the range.
Caldwell's AR-15 Pic Rail Brass Catcher attaches to the Picatinny rail of your AR-15-pattern rifle and covers the ejection port, guaranteeing that precious brass won't get lost in the tall grass to the side of the range. The catcher is adjustable to fit any configuration of optics on the rail, and has a quick-release to be removed, leaving only the single-post mount when not in use.
Rated for 100 pieces of .223 Rem. brass, the catcher has an additional feature certain to make life easier. At the bottom of the net-like material is a zipper to empty the catcher into your range bag or brass bucket, making sure the once-fired brass doesn't wind up on the floor or in the dirt.