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Hi David and welcome. If your Saint is 300BLK this will fit direct. The Saint AR in 5.56 has a thread pitch of 1/2 x 28 tpi and this would work with a 5/8 x 24 to 1/2 x 28 adapter: https://www.downrangeproductsco.com/product/1-2-x-28-to-5-8-x-24-barrel-thread-adapter-with-thread-protector-black-4243/ ---------- Cheers and stay safe!

Hi David, it depends on the caliber of your Saint. If you have .308 it will fit. If you have .223/5.56 you will need a 5/8 x 24 to 1/2 x 28 adapter. Stay safe & have a great day!