Sirex
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I am checking to try and find the barrel profile. Looks like a Hbar. The stock needs changing, and the muzzle nut needs replacing, but for 349? Not bad I suppose. Might be a decent starting point.
https://www.sportsmans.com/shooting...les/ruger-ar556-ar15-semi-auto-rifle/p/p42277
https://www.sportsmans.com/shooting...les/ruger-ar556-ar15-semi-auto-rifle/p/p42277