However, all of the documentation and advertising from Bushmaster say that a 450b upper with swap right on to your existing ar15 upper. In fact it's one of their selling points that you have one lower that can turn into different caliber guns.
MudBug wrote:Why fuss with all those funky buffers? Even with a standard buffer and no recoil pad I didn't find the recoil punishing, more of a big, slow push.
Yes I built a dedicated lower with a recoil pad, but that's just cuz I could, not because I was dying without it.
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