One of the issues there always is for that, is that there are hundreds of blaster brands. For example, these are the ones named on the Star Wars Wiki:
¦A43 Hushabye blaster
¦Bryar pistol
¦Coruscant Security Force issue blaster
¦Coruscant Security Force droid blaster
¦DC-15S blaster
¦DC-15s side arm blaster
¦DC-17 hand blaster
¦DD6 blaster pistol
¦DE-10 blaster pistol
¦DH-17 blaster pistol
¦DH-23 blaster pistol
¦DL-18 blaster pistol
¦DL-21 blaster pistol
¦DL-22 blaster pistol
¦DL-44 heavy blaster pistol
¦DT-12 heavy blaster pistol
¦Dual-trigger blaster pistol
¦ELG-3A blaster pistol
¦IR-5 blaster pistol
¦L-23 blaster pistol
¦LL-30 blaster pistol
¦KYD-21 blaster pistol
¦Model 22T4 hold-out blaster pistol
¦Model 434 blaster pistol
¦Model 44 blaster pistol
¦Model Q2 hold-out blaster pistol
¦S-5 heavy blaster pistol
¦SBP-200 blaster pistol
¦Scout trooper blaster pistol
¦SE-14 blaster pistol
¦SE-14C blaster pistol
¦SSK-7 heavy blaster pistol
¦WESTAR-34 blaster pistol
¦WESTAR-35 blaster pistol
Which would reqire 35+ different sets of special rules. Personaly, I'd totaly write down the specific make and model of my blaster pistol because it's cooler to pull out your DH-17 then your Pistol, but statisticly, it's not going to make a difference.