Bolts for the Excalibur Assassin Extreme: 16.5 in arrow, Flat nock, minimum 350 gr total (Excalibur minimum). Speed 400 fps with the 16.5 in Proflight arrow. The bolt length, nock and grain floor, and the dry-fire trap.
Updated 12 September 2026.
The right bolt for the Excalibur Assassin Extreme
The correct bolt length, nock and minimum grain weight for the Excalibur Assassin Extreme, and what stops a dry-fire.
| Bolt length | 16.5 in |
|---|---|
| Required nock | flat (flat-back) nock |
| Factory arrow | Proflight, 16.5 in carbon (ships with four) |
| Excalibur minimum | 350 gr total including point |
| Minimum total grain | 350 gr total (Excalibur minimum) |
Excalibur crossbow arrows
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The Assassin Extreme is an Excalibur recurve that ships with four 16.5-inch Proflight carbon arrows and lists a 350-grain minimum arrow weight, per its Lancaster Archery package listing. Like other Excalibur Micro-platform bows it uses a short flat-nocked arrow.
It takes the short 16.5-inch Proflight, not a 20-inch bolt. On a recurve the rail centres the string on a flat nock, so do not swap to a captured or clip-on nock made for a different bow, and do not drop below 350 total grains.