This is probably common knowledge already but I'll throw it out here anyway.  The front sight screws are a 4-40 x 5/16 cup-point set screw.  McMaster Carr has them for $4.25 / 100 pk. in stainless and $8.88 / 100 pk. in black.  With shipping $20 should get you a lifetime supply.  The local Ace Hardware stores have them as well in their fastener hardware section for about $0.25 ea.

 

http://www.mcmaster.com/#set-screws/=7rin3x

Share on TwitterShare on FacebookShare on WhatsAppShare on LinkedInShare on Pinterest