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RA Tech KWA LM4 NPAS Adjustable Bolt

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RA Tech KWA LM4 NPAS Adjustable Bolt

Quick Overview

Replacement Piston, fits KSC GBB M4


Out of stock



The RA Tech KWA LM4 NPAS Bolt is a full kit for adjustable velocity in your KWA LM4 or KSC M4 GBB airsoft gun. The completed bolt, or piston, features an internal adjustable NPAS valve, which allows for easy adjustment of the velocity in your gas blowback M4.

RA Tech's KSC M4A1 NPAS Nozzle is fully compatible with the KWA LM4, since the rifles use the same bolt or piston assembly. The bolt carrier is different, so if you are looking at the complete NPAS bolt carrier group, you will have to select a specific model. The bolt offered here is compatible with both KWA and KSC (or USA and Taiwan) M4 GBBs.

The rear of the bolt has been reinforced with an aluminum lockup, and the front includes the same steel insert for durability. Internally, RA Tech has equipped this bolt with their N.P.A.S. valve, which allows for the velocity to be adjusted easily using the provided tool.

RA Tech KWA LM4 KSC M4A1 GBB NPAS Bolt Features:

-Reinforced construction
-Compatible with KWA and KSC M4 GBB
-Fully Adjustable Internal Nozzle
-Easily Adjust FPS 

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