Obviously, we have some members here who are behind the times...
This is an efficient hold on the weapon if you're running something like an sbr. For a longer weapon, holding the weapon further towards the muzzle allows quicker transition between targets / better control of momentum.
Thanks for chiming in.
Have you used one?
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Loricatus,
You want the afg (by the way I'd go with an afg2, or consider the cobra tactical grip) mounted as far forward as your body mechanics allow.