Check out p. 23 - Disallowed Maneuvers, under the lead-in title "Aim, Concentrate, and Ranged Attacks."
(In fairness, this is not easy to find)
Quote:
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Originally Posted by TG
Aim, Concentrate, and Ranged Attacks: Aim or Concentrate
requires a Will roll at a penalty equal to your foe’s Trained ST,
modified for CP, maximum 0 – your CP may eliminate the
penalty but will never provide a bonus. If your ST is 20+, divide
this penalty by (your ST)/10; drop fractions. Failure means a Do
Nothing maneuver this turn; on a critical failure, roll on the
Unarmed Critical Miss Table (p. B557)! Ranged attacks do not
require a Will roll, but suffer the same penalty to skill.
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This means by grabbing his foe's weapon arm, Joe inflicts a -10 penalty to hit. The foe can shoot, but he's not likely going to hit much without an All-Out Telegraphic Attack (possible because melee distance).
This is a heck of a penalty, maybe too much - but the RAW are "if you're grappled you cannot use that body part," so I went with (and the playtesters didn't freak out) a very large penalty instead. Functionally "you can't do that," but with the right maneuver selection, but sometimes possible in the correct circumstances.