TL9 20mm Gun/Launcher

This weapon is intended for a mid-range Battlesuit weapon, essentially a low end Mecha Rifle. The various beam weapons are probably going to be the main armament for a Battlesuit, but I wanted to see if a old fashioned projectile weapon would still be useful.


20mm gun/launcher, TL9
Conventional long rifeled barrel (1200-1580mm, 47"-62")
Light automatic loading mechanism, caseless ammo
Malf: Ver, KE Dam: 6Dx3, 1/2D: 1260, Max: 5520, Acc: 12, SS: 20,
ROF: 8, Shots: 20, Rcl: -3, ST: 24
Basic weight: 45.5 lbs, Empty weight: 68.25, Loaded weight(max): 82.25
20 shot detachable box magazine
WPS: 0.255 lbs, VPS: 0.0017cf, CPS: $0.51
Cost: $6825

Various rounds damage:

Type Damg 1/2D Max Avg (Lam)
penetration
Mods
Solid 6Dx3 1260 5520 63
APC 6Dx3(2) 1260 5520 126 CPSx3
APCR 6Dx4(2) 1260 5520 168 CPSx5
APDS 6Dx5(2) 1890 8280 210 CPSx5, WPS:0.17
APDSDU 6Dx5(3) 1890 8280 315 CPSx10, WPS:0.17
APFSDSDU 11dx3(3) 1890 8280 346 CPSx12, WPS:0.17
APEX 6Dx3(2)[2d]
/1d+2 exp
1260 5520 126 CPSx5
HEAT 6D(10) 1260 5520 210 (105) CPSx3, WPS:0.17
HEDP 6D(5)[2D] 1260 5520 105 (52) CPSx3, WPS:0.17
Shotgun 7Dx2 126 552 49 WPS:0.1275, -1 Acc
Canister 9D 210 920 31 WPS:0.17, -5 Acc
Beehive 9D 126 552 31 CPSx4, -1 Acc, Imp damage

GYROC Rounds, Speed: 500, End: 1.03, no guidance, normal warhead, WPS:0.5, VPS:0.01

Type Damg 1/2D|Max Avg pen CPS
APEX 12D+2(2)[2D]
/3D exp
516 88 3.20
HEAT 9D+2(10) 516 335 (167) 1.92
HEDP 9D+2(5)[2D] 516 167 (83) 1.92
HEC 6D 516 ?? 1.28

If we assume that a TL9 Battlesuit will typically have around DR:100L, then only a few of the above rounds are useful. The Gyroc HEAT round is good, and fairly cheap. APC, APCR, APEX and HEAT would be the most common rounds, they have the minimum damage and good cost. HEDP would be useful with very light armored infantry, but not much else. Shotgun is not technically legal, but I plan to use it anyway as I plan a lot of standardized weapons around that bore size, YMMV. The damage is just right for light to medium armored infantry, even ICA has to worry. The canister and beehive rounds work for light & medium body armor and CID, but ICA is fairly safe. The Gyroc APEX is VERY nasty for ICA on down :)
Obviously this weapon needs a good 'scope with all the bells & whistles. It should also have some direct link to the battlesuit for the target computer information and a HUDWAC or better. A targeting laser probably wouldn't hurt either.


This web site and all contents within it not otherwise copyrighted are Copyright © 1997 Michael D. Ray. All rights reserved.

GURPS is a registered trademark of Steve Jackson Games Incorporated.

Last Updated: 08 Feb 97