The boarding shield has this text:
Cover gives DM-2 on ranged attacks, that much is clear and not in dispute. The "Armour +8" part of the text however, seems to refer to the "Hiding" section on page 74, which would put the shield on par with a stone wall. That seems reasonable. The part that sparked conversation was the first part of the rules for hiding:CSC p.106 wrote:Used by shipboard security personnel and law enforcement special-response teams, the boarding shield is a large movable obstacle. It cannot be used to parry but instead provides the Traveller with cover (Armour +8, see page 74 of the Traveller Core Rulebook for the effects of cover). Most boarding shields have a vision slit or firing port in the front surface. A boarding shield completely protects anyone hiding behind it and is large enough for two people to benefit from it simultaneously or move it forward while remaining covered.
Now, this clearly states that you cannot gain the benefit of hiding (and thus the armour bonus) while still attacking in the same round, yet the boarding shield that it has a firing port. This gives 2 options:CRB p. 74 wrote:If a Traveller is able to position himself completely in cover so the enemy cannot see him and chooses not to make any attacks, he can hide.
1. The boarding shield provides cover (and therefore DM-2 against ranged attacks) and you can use firing ports to attack while still in cover. If you want a bonus to armour you need to hide behind it and give up any attacks as normal.
2. The boarding shield provides both cover and a bonus to armour, while the firing ports still allow you to attack from behind it.
I myself am leaning towards option 1, but I cannot deny that there is some merrit in the second reading.