The stock band on the No4 is in a different place than the L42. You can't make one from the other without lots of woodwork. If anything, you need to start with a No.9 .22LR foreend. The No.7 is a No.4 variant and the No.8 was a failed factory attempt to create a 7.62x51 version of the No.4.
The Military Collectors forum (www dot milsurps.com), has a couple of photo galleries on the L42, and many knowledgible forum members.




























