Editing Line SI Bushmaster (section)

== Design and operation ==

The Line SI Bushmaster is a manually operated pump-action paintball marker based on the Nelson valve system.

The marker uses a sliding pump mechanism to cock the internal hammer and chamber a paintball before firing.

Its principal components were manufactured from machined aluminium.[1]

=== Bore-drop direct feed ===

One of the Bushmaster's principal features was its bore-drop direct-feed system.

Unlike earlier breech-drop designs, which allowed paintballs to enter a loading chamber behind the barrel, the Bushmaster's mechanism positioned paintballs directly into the barrel bore.

The manufacturer's manual described this arrangement as reducing the possibility of paintballs being pinched or cut by the loading mechanism.[1]

=== Auto-trigger ===

The Bushmaster incorporated an automatic trigger mechanism, commonly called an auto-trigger.

This allowed the operator to hold the trigger while cycling the pump, firing the marker each time the pump completed its forward movement.

The feature was intended to increase the achievable rate of fire during tournament play.[1]

=== Other features ===

Documented Bushmaster features included:

* Nelson-style valve system.
* Dual pump-action bars.
* Adjustable hammer assembly.
* Delrin bolt.
* Mechanical trigger safety.
* Front blade and adjustable rear sights.
* Optional constant-air operation.
* Alternative grip configurations.
* Different barrel lengths.

The manufacturer's manual also documented a lever-operated quick-change system for replacing 12-gram CO2 cartridges.[1]