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I tested one out at the ialefi training conference a couple back and it seemed to keep the gun nice and flat. Didn’t fire more than a mag through it though so take it for what it’s worth.
Interesting in that one video where the guy says "I can't believe it's a .308". Lately I've been working on a reduced load for my M305, and I've found an accurate load that I can shoot with just a t-shirt, hoodie, and maybe another fleece layer.
No recoil pad required.