I have to agree with Coils. I'd go to Fastanel, or one of those type distributors for hardware. Hardware store screws might be OK for trigger guards and the like,, but don't scrimp on something you are going to use in a high stress areas, like trunnions. Not worth the 50 cents overall you'll save, get them from Brownells, Midway AK builder or a top end hardware distributor instead that handles quality stuff. The Aubuchon Hardware stuff is all Chinese and iffy as far as quality control and tempering goes, even the threads are chit sometimes, and very poorly cut, IMO,, junk.
If you don't believe me just try this simple test, take a quality screw/bolt and a cheap hardware store one and torque them with a inch pound torque wrench till they break,Even grade 8's, then you tell me which is stronger. Honestly,, how much do you think you will you save? Seriously,,after all what are a half dozen screws going to cost anyhoo,, is it worth the chance??? I don't think so myself. A quality job always pays for itself in the long run. Even if only for piece of mind,, if nothing else.
I put one of the Brownells trigger guards on a buds Sagia for him and it could not have been simpler. Even riveted like I did it was a snap.