I have a Klinsky stock for a #4 Brno 22 target rifle. One of the receiver screws/bolt is to short for this stock. It's only holding by about 1 thread. I'm trying to find a Metric # 6 x 1 standard thread about 1 3/4" long. I've checked three gunsmiths but no luck. Is there a mail order place anyone know of or anyone have a spare ?