Try Brown Precision as well. They show a nice dangerous game model that may fit your bill for around ą$500 US.

Attitionally, Sunny Hill Mfg. has several drop style magazines for Mod 70's.

Here is a link for Brownells also.:

http://www.brownells.com/aspx/NS/store/P...LOORPLATE#specs

http://www.sunny-hill.com/products/assemblies/winchesterpost64.html

http://www.brownprecision.com/default.htm

Good luck...................Lee