From the latest Rule book....
(a) THE FOLLOWING ACCESSORIES ARE ALLOWED:
(1) Ambidextrous safety.
(2) Beavertail grip safety.
(3) Extended magazine release.
(4) Full length recoil spring guide rod.
(5) Extended slide release.
(6) Rubber covered or synthetic main spring housing.
(7) Aluminum or synthetic trigger.
(8) Magazine base pads.
(9) Checking or stippling to the finish.
(10) Any exterior finish eg: Armaloy, Teflon, Black Oxide, etc.
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(11) Commercially manufactured rubber sleeve on grips is allowed providing no
safety features are disengaged.
(12) Flared magazine well which flares the base of the grip.
(b) THE FOLLOWING ACCESSORIES ARE NOT ALLOWED:
(1) Sight ribs.
(2) Extended front sights.
(3) Compensators.
(4) Magna-ported or ported barrels.
(5) Barrels which extend beyond the slide or bushing, to make them longer than
the original barrel. (6 inch maximum length)
(6) Extended magazines.
(7) Grips which flare at the base.
(8) External weight systems.