Sheridan K Series Rifles
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   When Paintball was still in the early days of development, Sheridan/PMI realized the potential of the sport began marketing their own line of guns. Sheridan released 3 distinct categories: PGP series, P series and finally the K series. The K series rifles have one very distinct feature: they came with a wooden stock from the factory. Today, these rifles are highly sought after and are snatched up by avid collectors (myself included). What does seem to cause confusion amongst many collectors are the different types of Sheridan K series rifles.
Classification
K1: The information on this particular K series gun is extremely difficult to come past. Many die hard collectors believe that this gun never did truly exist and I myself am inclined to agree with them. The K1 rifles were allegedly bolt action rifles powered by dual 12 grams and required the user to load one round at a time (ie: no stock tube). Aside from this, there is very little additional information to be added.

Note: After approx. 5 years of monitoring collector pages, ebay and a variety of forums, I have never seen an actual picture proving  the existance of this particular marker.
K2: The K2 marker is far more realistic than its alleged predecessor. This gun is another bolt action marker powered by a single twelve gram located in the tube under the barrel. It sported a full length stock and carried 14 rounds in a tube parallel to the barrel. This arrangement required the user to "rock and cock" in order to load a paintball. Highly sought after today, these babies can fetch as much as $500 U.S. depending on condition.
KP2: The KP2 marker was Sheridans leap from bolt action to pump action. The KP2s were stock class markers which were operated by  "pumping" the marker to load a ball. The marker still requires the user to "rock and cock" but was still far more practical than the original bolt action markers. At this point, Sheridan decided to keep the markers powered by a 12 gram and not C/A.
KP2-DF: The KP2-DF markers were introduced in order to offer the user more firepower. In order to do so, a directfeed (hence: DF) replaced the traditional stock tube allowing up to a 200 round hopper to be attached to the marker. Otherwise, the marker did not change from the KP2.
KP3: The KP3 was Sheridans response to C/A or bulk CO2 tanks. In order to meet the always needed "increased firepower", the traditional twelve gram was replaced by an "underslung" CO2 tank as shown below. These markers were also blessed with a new style bolt named the "speeddemon".

Note: There is often confusion between the KP2-DF an KP3's. It is actually quite simple to differentiate between the two. The KP2-DF had a bottom tube which almost touched the tip of the barrel whereas the KP3 had a botom tube which was far shorter.
Pirahna Rifle: The Pirahna Rifle is yet another marker around which there is a lot of confusion. Many believe that this marker and the KP3 were one of the same. I for one see things differently. Shortly near the end of the production of the K series markers, the final design (KP3) underwent numerous changes. Firstly, the stock received a somewhat altered form as did the trigger group and the trigger guard. What really leads me to believe that this marker DID in fact exist was the fact that it was quite near the end of the production when Sheridan sold the K series rights to PMI.  If the changes to the KP3 were in fact a result of the change of company than the Pirahna Rifle was born.

Note: This is my own interpretation on a series of events and changes. There is no concrete evidence that it did or didn't exist. Any further information would be greatly appreciated.
Derivitives
   Over the years, K series markers were used as a base for several custom shops. These custom shops created the following markers.
Mac 1 Annihilator Rifle: Mac 1 was at one point one of the most well known names in the paintball industry. They created a variety of markers (Avenger, Annihilator 1, Annihilator MK 2) but one of, if not the most impressive of their creation would be the Annihilator Rifle shown to the right.
RTP Viper Rifle: RTP (Rick The Prick) was a custom shop in California. They customized Sheridan based guns usually giving them C/A, Direct Feed, a retractable squeegee in the lower tube and a Stainless Steel finish. The pistols (PGP, P-series) are extremely rare. The RTP Viper Rifles however are in a league of their own. The RTP Viper Rifles have one distinct feature: their stocks have been modified to allow a 3.5oz tank to been screwed in. RTP Viper Rifles are extremely rare and sought after. During 5 years of searching the web, I've found 3 pictures of an RTP Viper Rifle.