You could arm some of them (let's say one wiould be the model A and the other the model B) with meson bays instead. The PA is more useful against unarmored ships (more damage dice, not affected by config nor meson screens, though those latter are unlike to be found in small ships), aside from cheaper, but the mesons are deadly against armored ships.
Somehat ironically, the ships larger than the destroyer all have meson screens, so a PB bay might be more effective against them

Nontheless, even a few of them can give a nice defense DM against both missiles and lasers if you use HG combat (barrage) rules. Not so sure if you're using CB combat rules...
The biggest ship I have planned is 6,000 tons, which makes the barrage rules marginal for use.
Something I noticed in the anit-missile rules in CB though. The only modifier listed is for firing at successive missiles the same round. It appears that the range and accuracy of the laser don't come into play. If this is the case, a mix of pulse lasers and particle beams on a warship seems somewhat more optimal (since a pulse laser can probably hurt a fighter, while a beam laser probably can't).
EDIT. Ack! Missed all of the errata on p.HG 47. Pulse lasers get a flat -2 tto-hit.
There are rail guns in MgT:HG (and I've read here there are rail spinals in TCS, though I have no access to it)...
Sorry, very poor wording on my part. I know HG has railguns, but their short range makes them speciality weapons, no standard weapons.
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