In a recent clean up, I found 4 actions screws and don't know what they are for. Meanwhile, I have an 03A3 Springfield and an Arisaka and don't have action screws for them.
Looks like 2 are 1/4"- 26, 1 is 1/4"-28 and 1 is 1/4"-30.
Is there a reference book with a chart or a chart on a website that will tell me the different thread pitches that various manufactures use?
