Tier 1 Upgrade for PTS RM4 (Gen. 1)

Take your KWA PTS Magpul ERG rifle to the next level with the Tactical Parts Tier 1 upgrade package!

With the introduction of the original KWA Magpul ERG, the Tier 1 Upgrade was soon formulated to improve key areas of the system, namely: accuracy, FPS consistency, durability and trigger response. As a stock rifle, the KWA is a solid contender and offers the best-in-class recoil experience, but it is lacking in certain areas. Like many factory guns, there is no such thing as AOE correction (Angle Of Engagement) of the piston, which is the most common source of piston failure. As well, the thin rubber pad on the backface of the cylinder head can break free and cause a piston jam. The heavy non-ported piston head is a tough design, but lacking ports, it isn't ideal for maintaining a good air seal. The infamous KWA air nozzle is also the primary source for FPS loss in these guns, as it lacks an o-ring and can have issues sealing with some aftermarekt buckings. While the motor has been slightly upgraded on the newer generation rifles, it is still a basic traditional ferrous magnet type, and is weak in light of aftermarket Neomydium motors.

My goal with the Tier 1 package is to address all of these areas and tap the full potential of the system while keeping the good - namely the immensely strong KWA gearset and bearings.

On the accuracy side, reducing FPS variance between shots and eliminating air loss ultimately helps to improve accuracy. This is accomplished through improved parts selection: name an o-ring air nozzle, ported piston head and double o-ring aluminium cylinder head. Air compression is checked every step of the way, ensuring the tightest seal possible. As a final improvement, consider adding in a Lambda One stainless steel inner barrel and R-Hop installation for the ultimate in accuracy. Lambda barrels are made in Japan to exacting tolerances using cold forged SUS304 stainless steel. R-Hopping is by far the best thing presently going for obtaining increased range and accuracy and excels with heavyweight BB's.

One of the chief complaints of many KWA users is the slow trigger response and being able to "outrun" the trigger; sometimes inadverdently causing the gearbox to lock up. That's why every Tier 1 upgrade is outfitted with an ASG Neodymium magnet motor, which dramatically improves rate-of-fire and felt trigger response. Optionally, the new Warhead brushless motor is now available which offers unparalleled efficiency, response, and cooler operation.

As standard fare, each rifle is also hand fitted with a Krytac flat trigger, which helps reduce the overall felt travel distance. If this trigger shoe doesn't meet your preference, an alternative trigger style may be fitted upon request.

The beating heart of the system - the piston - is upgraded with the legendary CYMA FMR and Lonex POM piston head. This piston has proven itself to be extremely durable. To date - and over hundreds upon hundreds of installations - none have been reported to fail, and none have been observed. 

Finally, a basic hardwired MOSFET installation, such as the Gate NaonoASR, has the benefit of protecting your trigger contacts from arcing and burnout. It also slightly helps increase the trigger response time. More advanced MOSFET's, such as the Gate WARFET have the benefit of programmable fire modes such as 3-round burst, semi-auto lock, Active Braking, Pre-Cocking, and more. The NanoASR is a no-frills compact MOSFET and takes up minimal space, whereas the WARFET will require a larger stock such as the PTS EPS or a Crane style stock. The NanoASR can be upgraded to the WARFET at any time with it's simple and easy plug-and-play ability.

With any MOSFET installation, I completely re-wire the gun with low-resistance 16AWG Alphawire EcoWire, which is some of the best wiring available for Airsoft guns. As well, new motor connectors are fitted, the fuse is removed and a Deans plug soldered in, further reducing electrical resistance.