The Design of the RT/RTP valve is very similar to the A.I.R. valve with a few changes here and there that make it much easier to attain high rates of fire. The glory of the ReTro valve is its unbelievable recharge rate(Fastest Recharging Valve in the world). Provided you have the means to pull the trigger as well as load fast enough, along with an excellent air supply, you can attain a ROF beyond 30bps without drop-off.
What makes it easier to shoot faster is how the valve reacts when you pull the trigger. With a standard on/off assembly, the trigger pull weight to engage the sear is 3lb.(weighed from the top of the trigger, it's lighter pulling from the bottom) Once you pull the trigger and cycle the valve, the trigger is instantly pushed back to the starting position with 6lb. of force. This reactivity eliminates human pull slop so you dont have to work as hard to achieve a higher ROF.
The RT/RTP are different from the A.I.R. valve in the fact that they require a Compressed Air/ Nitrogen system to operate. DO NOT run Co2 in these valves. However, like the A.I.R. valve, you do not need a external regulator to properly run this valve. Although the design is the very similar, hardly any parts of the A.I.R. valve and RT/RTP valve's are interchangeable. The Power tube internals whether they are level 7 or level 10 remain the same(see section Level 7 or Level 10 for operating details)
Differences between the RT and RTP
Pictured above is an RTP valve. The difference between the RT and RTP mainly lies in how air is delivered to the valve. Performance is the same same but on the RT, the air is sent into the valve thru the field strip screw. This screw is called the Banjo bolt(pictured below). On an RTP(and on all other valves) the air inlet is on the side of the valve. As far as the valve goes, all the parts between the RT and RTP are the same(different on/off pin lengths though - RT.750", RTP-.765") except for the field strip screw and the Banjo bolt. The RT has it's own rail, body and trigger frame. The Rail and body for the RTP are the same as the Emag. The trigger frame for the RTP can mount on an Automag or Minimag. They both also have different trigger rod lengths(RT-1.945",RTP-1.998").
Banjo Bolt for RT