I have a brass catcher made by E&L MFG up for sale. Its in like new condition. It worked great on my A1 upper. I know only have flat top receivers. This one will not work on flat tops.
Link to E&L MFG www.brasscatchers.com/brass.htm
Photo of brass catcher on rifle. Photo from E&L site
Photo Of the one I have for sale
E&L has them listed at 34.95 Plus S&H I will sell for $25.00 shipped.
I can do paypal or PMO. Paypal will be plus 3%
3/9/06 edit with better photo and info