Ram
In the Autococker, the low pressure regulator drives the ram, thereby retracting and closing the bolt.

Rate of Fire (ROF)
A measurement of how many balls you can offload, usually measured in balls per second. It varies from the theoretical (ie the Automag RT can fire 26 balls per second if you have a robotic trigger finger) to the practical (your semi needs to manage more than five balls a second to be considered a decent paint-chucker)
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Recreational Ball (Rec-Ball)
Paintball played for fun as opposed to Paintball played at tournaments for competition (tourney-ball).

Regulator
A regulator takes gas and steps it down to a lower and more consistent pressure.

Remote
A tube that runs gas from your gas source to your marker. Remote also refers to the look that comes over your significant other's face when you start describing your day's Paintball exploits.

Repetitive Strain Injury
Cumulative damage of soft tissues caused by a repetitive action such as pulling your trigger or vigorously polishing your barrel.

Robbo
A highly opinionated English Paintballer who responds favorably to young ladies from any country and unfavorably to anyone who's first name is Fred (we all await the lawsuit).

Sear
In non-electronic markers, the sear is the piece the interface between the trigger and the hammer (see hammer).

Semi-Automatic (‘Semi’)
A marker (or a setting on an electronic marker) that releases a single blast of air (ergo, Einstein, a single paintball) with each single squeeze of the trigger.

Scenario Game
A type of Paintball event where players assume characters and play out scenarios: these can be militarisitc, futuristic, or based on books/films.

Short-Stroke
If you are not in the world of the binary, a short-stroke is when you do not pull your trigger correctly, interfering with the way your marker cycles. In a best case scenario this leads to a missed shot, in a worst case scenario you end up with a chop (see chop).

Sitters
Alabama ticks. A negative term for players who find the biggest bunker on the break and dig in for the rest of the game.

Smack Talk
Also known as ‘Sledging’, Smack Talk is the practice of hurling abuse at an opponent whilst on the field of play. Favorites include ‘Yo momma’s so fat, yo daddy’s ears pop when he climbs on top’, ‘You make Fred Schultz look good’, and ‘Show me your ass, bitch’ (Copyright Marty Bush, 1995).

Spannered
Covered in paint by an opposing player (s). Also ‘painted’, leathered’, and ‘smacked upside the head’.

Speedball
Paintball played on an open field with uniform cover. Today's concept fields (such as Hyperball and Sup'Air ball) are Speedball fields.

Spray
Literally, spray is the paint that lands up on you after the paintball has burst elsewhere. In tournaments half of the time marshals are involved in determining whether a splodge of paint is a hit or "only spray".

Spray and Pray
Pejorative (go grab your English dictionaries) term for players who fire paintballs indiscriminately in the hope of hitting an opponent.

Squeegee
Rigid, straight apparatus for inserting up your barrel. Used to clean barrel breaks.

Sweetspot
Shooting into a sweetspot (sweetspotting) is shooting in the hope of hitting an opponent that you either cannot see, or to a place where you expect them to be moving into shortly.