Tired of expensive ($40+) weak Field Targets that do not resist the sustained shooting of heavy magnum airguns, I decided to make myself a heavy duty one. Recently I finished this first prototype entirely made of some steel scraps and a pair of 4" door hinges, which costs me close to nothing and took a couple of hours to complete it. The base is an 8 inch square of 1/2" thick steel plate. The crow silhouette was plasma cutted from 1/8" thick steel plate and the kill zone was cutted with a 1-1/2" diameter hole saw from a 1/4" thick steel plate. Other parts are a 3/8" hex nut fashioned as a sear to firmly engage the kill zone disk an prevent the crow from falling when hitted out of the kill zone, three pieces of 1/2" diameter steel rod for the kill zone support and as crow's counterweight for positive fall, and a short piece of 1/16" stainless steel wire to hook the resetting string. Everything was assembled together with electric arc welding. It is heavy at around 15 lbs so I don't see the need to stake it down because it doesn't seems to displace when hitted. I have limited shot tested it with a .22 cal Logun/Domin8or shooting 21.1gr Beeman Kodiak pellets at velocities up to 850+ fps from 20 yards for 50 hits inside the kill zone and 50 hits on the crow's silhouette without a single malfunction so far.
Once I heavily tested it will post shop drawings for anybody interested in build his/her own.