The receiver used on the build for this gun originally was from a Beeman 1085 in. This build is, as far I know, the very first custom that was built off that platform with these three goals in mind. First was to convert the gun away from CO2 to HPA/PCP power, the second was to retool the feed system and the barrel to make it a. Gun, and finally the synthetic stock took was to be replaced by a nice wood stock.
The decision to steer away from CO2 was based on the common knowledge that CO2 is a temperature sensitive power source. When shot rapidly, CO2 cools itself as a simple matter of turning the liquid CO2 into usable gas to fire any "air" gun. It can be allowed to warm between shots but the speed of warming, and if warming is even possible, is subject to ambient temperatures. It will shoot with fastest when warm and slower as it cools. It also shoots slower when the CO2 cartdidges get low.
The speed change from shot to shot reduces accuracy drastically. Now this gun is designed to shoot off a regulated air bottle that can be removed and replaced with a the spare fresh bottle during shooting.
The bottle is much wider than the tubes that hold CO2 cartridges so a power supply like from a QB79 was fitted to the 1085 receiver. This allows the bottle to sit low compared to a CO2 powerlett tube, enough to be clear of the barrel as seen in the photos. The regulator on the bottle neck is a devise that takes the air in the bottle that is highly compressed, up to 3000PSI in this bottle, and reduces the pressure fed to the gun to a level of the peak performance of warm CO2.
So every shot from the gun is now a "regulated" at +/- 850PSI giving a full bottle of air worth of shots at the same power level every pellet. This increases accuracy dramatically by removing the temperature sensitive CO2 variables from the equation.Obviously when the tank is below the pressure of the regulator setting the gun needs to be filled or the second tank needs to be screwed on the gun. In addition, the bottles are protected from over filling by a bust disk that safely empties al pressure if safety tolerances are exceeded. A second bust disk will also dump the air if there is a regulator failure and pressure exceeding what may damage the gun is allowed to pass the regulator. These burst disks are readily available as spare parts and simply screw into the tank regulator neck. Additionally I believe that bottles are a better choice than built in air reservoir if you don't intend to use SCUBA or SCBA (breathing) quality dried air. Hand pumps, when used to fill guns, will inevitably introduce atmospheric water into guns. But the shape of the bottle allows for a low spot where water can safely condense without immediately dumping into the gun mechanism. PCP Guns with no bottle usually require disassembly to some degree to purge water. From the guns, be emptied of air and, internally dried.
To convert the gun to a. 177 the receiver was mated with a Benjamin Marauder shaped. This allows standard Benjamin Marauder. 22 cal magazines to be used in this gun.
This maintained the repeater action of the Model 1085. 22 bolt with a custom larger derlin handle and. 22 breech seal was fabricated to feed the larger pellets as well direct air flow out the barrel as the gun had been designed. Finally, the synthetic stock was discarded and replaced with a nice wooden stock. The look is a very nice compliment to the rifle.
This was originally designed as a very stable right handed target gun stock. It further improves the accuracy of this gun. THIS GUN IS CRAZY FUN!!!!!!!177 Pellet Air Rifle + 2nd bottle, 2 Mags, Moderator & Scope" is in sale since Sunday, November 17, 2019. This item is in the category "Sporting Goods\Outdoor Sports\Air Guns & Slingshots\Air Rifles".
The seller is "good-stuff-cheep" and is located in Framingham, Massachusetts. This item can be shipped to United States.