Editing Pump-action paintball markers (section)

== Principal operating systems ==

=== Nelson-based markers ===

Nelson-based pump-action markers use a mechanism derived from the original Nelson marking equipment.

These designs generally incorporate an inline bolt and hammer arrangement.

The manually operated pump recocks the hammer and cycles the bolt.

Examples include:

* [[CCI Phantom]]
* [[Line SI Bushmaster]]
* PMI Trracer
* ACI Maverick
* Lapco Grey Ghost

Specific components and operating details vary between models.[2][3]

=== Sheridan-based markers ===

Sheridan-based pump-action markers use mechanisms derived from Sheridan marking pistols and rifles.

Many incorporate stacked-tube bodies, with the bolt and firing components arranged in separate but connected assemblies.

Historical examples include the Sheridan PGP and various PMI pump-action models.

The [[WGP Sniper]] also incorporated engineering principles associated with Sheridan equipment.

Sheridan-based designs contributed to the later development of the semiautomatic Autococker.

=== Other mechanical arrangements ===

Not all pump-action markers use directly interchangeable Nelson or Sheridan mechanisms.

Manufacturers have developed alternative valve arrangements, body configurations and pump assemblies.

These differences can affect maintenance procedures, component compatibility and the marker's operating characteristics.