Thanks everyone for the replies. I've already done the cut on a damaged No 4 stock and inserted the patch. Just waiting for the handguard to arrive and have the barrel fitted. I'll post a before and after when it's done, once again thanks for the measurements.
Bob

---------- Post added at 09:13 PM ---------- Previous post was at 09:11 PM ----------

Quote Originally Posted by smle addict View Post
Hello,

I just pulled apart two of my No.5s, and here is what I came up with

(all measurements taken from the rear of the handguard)

overall length=225.42mm

length to the barrel band groove=201.61mm

barrel band groove=11.11mm

remainder, from front of groove cut to front of handguard=12.7mm

Handguard manufacturers were both Fazakerly (F) and BSA (M47A).

Best of luck with the project.
Thanks so much for your efforts. Just what I wanted. Bob