The two new configurations use the modified rules for determining a weapon's Acc that I introduced in my post for new beam types for the design system. The equation you need is:
Acc = Ca×Ab
Check the post linked above for explanation, as this post will only give values for Ca for the configurations.
A two-handed weapon that is shorter than a rifle, resulting in a shorter sightline and focusing array, but more stable than an equivalent pistol, with a more compact frame with a lower bulk. Typical of PDWs, short carbines, and weapons designed for CQB.
For SMGs, Ca is 1.5, ST multiplier is 2.2, SB is 1.5, and minimum Bulk is -2. Use Beam Weapons (SMG) to wield – this is a new speciality of the Beam Weapons skill, defaulting to DX-4, other Beams-4, or Guns (SMG)-4. Optionally, if using the revised Guns specialities (Pyramid #3/65, p. 16), SMGs are wielded with Beam Weapons (Long Arm).
A long, thin weapon of the size and shape of a staff, with the optics, accelerators, or other internal components distributed through the long haft. The lack of a stock or proper sights reduces accuracy, though advanced shooters can mitigate this by holding the staff over the shoulder like a rocket launcher to use the entire length of the weapon as a sightline.
For staffs, Ca is 0.75, ST multiplier is 2.4, SB is 1.5, and minimum Bulk is -4. Use Beam Weapons (Staff) to wield – this is a new speciality of the Beam Weapons skill, defaulting to DX-4, or other Beams-4.
Here are two examples of weapons created using the system.
Laser PDW (TL10): A two-handed laser weapon using the same generator as the heavy laser pistol (GURPS Ultra-Tech, p. 115) with a higher rate of fire, mounted in a compact carbine frame with an integrated stock, pistol grip and foregrip, like an FN P90.
Goa'uld Staff Weapon (TL11^): A long, two-yard staff with weighted heads on either end. One holds the emitter of a plasma weapon and the other holds a naqada fuel cell (a superscience nonrechargeable power cell). The staff can also be wielded as a melee weapon, acting as a quarterstaff (GURPS Basic Set, p. 273) with +1 damage per die for swing attacks only. The staff is both Cheap (-1 Acc, -1 Malf., -0.5 CF) and Heavy (+50% weight, -0.25CF).
|12d(2) burn ex||2||300/900||4.3/C||3||95(3)||4†||-4||2||$1,280||2|||
 Malf. 16.