Some form of bayonet has been standard issue to soldiers for a long time. So it should be in the 40th millennium.
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The knife bayonet
Replaces 'knife' in standard guardsman kit
A normal sized knife.
Weight 250 grams.
By itself
Does 1d5 damage
When attached to a basic weapon:
1d10 primitive (8) damage
When attached, a shot taken with that weapon over basic range suffer a -10 penalty to hit.
Taking the 'melee attachment' upgrade to your basic weapon eliminates this penalty.
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The Sword Bayonet
Replace knife bayonet for 3 gear points.
As infantry rifles became shorter, they lost some of their utility as spears. The longer 'sword bayonet' was an attempt to keep the overall length of the rifle-spear the same. In addition, you could execute some cutting attacks with a sword bayonet equipped rifle that you couldn't with an older style spike bayonet.
A small sword, with roughly 45 to 60 centimeters of blade.
Weight 750 grams
By itself
1d5+2 damage
Balanced
When attached to a basic weapon:
1d10 +1 damage
Unbalanced
When attached, a shot taken with that weapon over basic range suffer a -10 penalty to hit.
Taking the 'melee attachment' upgrade to your basic weapon eliminates this penalty, in addition, it removes the unbalanced quality.
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The Chain Knife bayonet
Replace knife bayonet for 8 gear points
If a knife attached to the end of your rifle is awesome, an small chainsaw is even better.
A small chainsaw, roughly the same dimensions of a knife.
Weight ?? 1 kilogram ??
By itself:
1d10 +1 damage
Penetration 2
Tearing
When attached to a basic weapon:
1d10 +3 damage
Penetration 2
Tearing, Unbalanced
When attached, a shot taken with that weapon over basic range suffer a -10 penalty to hit.
Taking the 'melee attachment' upgrade to your basic weapon eliminates this penalty, in addition, itremoves the unbalanced quality.
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The Chain Sword Bayonet (replace knife bayonet for 10 gear points)
If attaching a little chainsaw to the end of your rifle is awesome, attaching a bigger chainsaw to the end of your rifle is over 9000.
weight ?? 3.5 kilograms ??
By itself:
1d10 +2 damage
Penetration 2
Tearing, Balanced
When attached to a basic weapon:
1d10 +4 damage
Penetration 2
Tearing, Unwieldy
When attached, a shot taken with that weapon over basic range suffer a -10 penalty to hit.
Taking the 'melee attachment' upgrade to your basic weapon eliminates this penalty, in addition, it changes the 'unwieldy' trait to 'unbalanced'
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Attaching or removing a basic weapon is a half action. Remember that you may also need another half action to ready (or put away) the bayonet.
Edited by crusher bob