The flash hiders are presently available from Numrich as the originals are expensive, I know, I have one for sale and want lots for it. The last ones Numrich had were less than perfect but these might be better. I also have a barrel loose right now so could take measurements for you... The wood has been done from #4 wood, including the butts. Peter Laidlerdid lots of them and told us about it in old posts...
By the way, here's your other post. I could show you how to find them...if you like... https://www.milsurps.com/showthread....931#post425931