For What Firearm?

[Gun Shooter]

I have a beautifily made Stripper Clip and Guide I need help identifying. The stripper is 6 3/16" long, .505ths wide for the the case head (rim), .345ths wide for the rebated rim, 2 3rds of the way up are several slots into which a flat spring is inserted, when the stripper is inserted into the guide the spring is elevated and the rounds are loaded into the stripper, when the guide is removed the spring lowers and locks until you insert it into the guide again and load the magazine. FOR WHAT FIREARM IS THIS????