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!

This is the OG Tier 1 Upgrade that started it all! 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 aftermarket buckings. While the motor has been slightly upgraded on the newer generation rifles, it is still a basic traditional ferrous magnet type, and is comparatively weak and inefficient compared to Neodymium and brushless designs.

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.

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 improved motor, which dramatically felt trigger response while maintaining an optimal rate-of-fire for the recoil system. Optionally, the new Warhead brushless motor is now available which offers unparalleled efficiency gains, response, and cooler operation.

On the accuracy side, reducing FPS variance between shots and eliminating air loss helps to improve accuracy. This is accomplished through improved parts selection: namely 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. A Lambda One stainless steel inner barrel and Tru-Hop Gen. 3 bucking installation provides an incredible improvement in accuracy. Lambda barrels are made in Japan to exacting tolerances using cold forged SUS304 stainless steel. This combination excels with heavyweight BB's, allowing you to reach out and touch the competition.

Newly updated revisions of the Tier 1 Upgrade now come fitted with a Perun MOSFET, which is much smaller than previous designs used and has the benefit of reducing the amount of space taken from your battery storage area. A MOSFET protects your trigger contacts from arcing and burnout, and also further helps increase the trigger response time.