![]() Use in conjunction with a good quality chronograph to ensure the power level stays within the legal limit for your country. Features BEST Fittings’ Gas Ram Adaptor with quick detach kit for ease of operation. “Slim Jim” Gas Ram Pump kit for adjusting your Theoben / Weihrauch Gas Ram pressure. It takes a bit of practice to do without a “POP” and a cloud of oily air being evident. If I go over the 12ft/lb limit I gently tap the valve with a pin punch about “PFFFFFFT” is enough.To achieve FAC velocity the stroke is increased to 3.2 inches the eliminator has a stroke of 3.7 inches. The diameter of the (dummy piston) or gas ram on the “HE” model is 1/3 of that of the earlier one and the pressure goes up from 300 psi non “HE” to 750 psi “HE”. ![]() The stroke of the piston on a 12 ft lbs Theoben gas ram is 2.6 inches “HE” or not.It needs more pressure because the later Theoben’s have a short stroke length of just over two inches, with a cylinder bore of just over an inch.What is “HE” and why does it need more pressure? “HE” = high efficiency.The pre-HE models run with half or less of the “HE” pressure.If it takes that much to get 11+ftlb, then the gun needs new breech, piston and ram seals. More than 1000PSI risks damage to the ram. 800-850 is most common, but I’d suggest to start at 700PSI and work upwards. The “HE” models (HE will be stamped on top of the breech) run at 700-1000PSI, depending on barrel length, calibre and the condition of the gun.Some useful information from: AirgunBBS Forum Thread 245395 Want to purchase the cutting edge FX Airguns Pocket Chronograph from our store? BUY HERE 1-BA, and Standard Schrader Valve threads.ĭO NOT USE A DIVE CYLINDER. Bottom Entry Gauge – Charging Kit Gauges.Rear Entry Gauges – Cylinder Valve Gauges.HPA Paintball and Airsoft Tank Filling Equipment Medium pressure (650 Newton’s) These are the most commonly used gas ram as they offer the perfect balance between power and accuracy.I stopped at 22 bar just to see how it cocks. Before the partial tear down I did de-pressure the chamber. I was going to tear it all down, but thought I'd wait for a new seal to come in along with the factory pin. Considering the force that joint takes, it should have been made better. I plan on finding a bronze bushing or maybe even a bearing to place into the cocking lever so this never happens again. The original pin was half way cut through! I found a hardened steel die that had the same 5mm diameter and cut it to length to use it for a while. I made a pin for it but the lever is also worn a little. I had already worn it out after my 1000 shots since buying it. But I noticed after cocking that the cocking lever was lose at the barrel pin. I wasn't sure what it was then the auto safety stopped working. Make sure to use plumbers tape on the joints. The gauge reads in PSI and BAR so you know how much to pump it. Plus you get a bike pump for other things. Of course this adds value to your air rifle since you could sell the kit with it. Now you can tune your RX2 and or rebuild it. RockShox High-Pressure Shock Pump 600psi with gauge $43 Amazon Pro plumber air valve 1/8 Lowes part 77200 $3.50ĥ. Gun is incredibly accurate at this pressure. BrassCraft 1/4 FIP x 1/8 FIP reducer 119-42xP Lowes $4Ĥ. Average chrony fps is 1007 with Kodiak match pellet: 23.99 ft. Viair 90001 1/8" Female BSP - 1/4" Male NPT Adaptor $6 - Amazonģ. Our goal is to get to a schrader valve.Ģ. ![]() The threads on the adapter are 1/8" BSP (british standard pipe). Please make sure your gas ram has a threaded. If you want to build your own kit the first thing you need is the theoben gas ram adapter from Best Fittings or Rapid Air Weapons. This listing is for a new hose to rifle adaptor to enable you to re-set the correct pressure in your gas ram rifle. You can buy the whole kit ready from best fittings in the UK for 85EU plus shipping and taxes. ![]() One of the reasons I bought the HW90 was that I found that you can change the ram pressure.
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