MrProper
Well-Known Member
At least for me, there is no difference between B-6 and Irvin in terms of range of motion. The B-6 has the action back, but the Irvin has the underarm gussets, which work really well.the one advantage the B-6 has is that it does not feel as bulky as the Irvin and gives you a bit more freedom of movement due to it's lighter construction and bi-swing back. and of course it has two front pockets...