I have a local fastenings company that I'm sure will have the allen head in that size, I get various sizes from them including some odd size ones, for all my rifles, cutting them down to length is no problem, don't get stainless as you can get sticking issues with dissimilar metals, and stainless is also low torque, get 10.8 grade as minimum or 10.9 (very apt for shooters!), cost will be pennies.
If you get stuck, email me and I'll see if I can sort some for you.
Just checked and they don't stock them, they gave me "Spalding Fasteners" as a supplier likely to have them, I looked on their site and found them in hex head 6mm fine, all lengths in 10.9 grade, but I suspect a phone call would also find allen head. The cost looks little, but the site is confusing, if you can't find them I'd suggest giving them a call.
Last edited by RobinC; 26-07-2017 at 11:57 AM.
Walther KK500 Alutec expert special - Barnard .223 "wilde" in a Walther KK500 Alutec stock, mmm...tasty!! - Keppeler 6 mmBR with Walther grip and wood! I may be a Walther-phile?