ASGI upgrade service

Would anybody trust this?? Slob, you made a few suggestions for me a while back. For a KWA M4, can anybody tell me if this would be a good idea?
http://www.airsoftgi.com/product_info.php?cPath=67_68&products_id=154

cheaper on evike and if it's a KWA don't do anyting to it

Quote :

General Information:
Muzzle Velocity: 420FPS - 440FPS (Airsoft GI does not guarantee FPS, the range given is meant to be used as a guideline not an exact measure)
Materials Used: M130 spring, Metal Bushings, Silent Head Set, G&P Polycarb Piston, Systema Torque Up Gear Set, Spring Guide

1, Hope this is going into a re-enforced GB.
2, Metal Bushings from WHO ?, Some companies use very high content Magnesium Bushings, they do run a bit quieter, but they also wear out real fast, and on a Power Set up, chances are, when they give up the Ghost, more than just the Bushings are going to be damaged.
3, Silent Head, Why, the GB is louder than the shot .
4, Spring guide and Piston Head with Bearings ?, This leads to an abnormal Spring Twist during compression, damaging the Spring, and can result in the Spring Breaking, guess what happens to the Piston when that happens, or worse yet when a piece lands in the GB.
5, Is the Magnum Motor also part of the Deal, if so, Does it come with the Hardened Pinion Gear ?
6, Why a Half Tooth Piston ?, The Systema Gears in the Picture are Straight Cut, not Helical.

Quote :

For best results seek consultation by calling Airsoft GI before finalizing order.

Definitely !!! Before placing and order.

Or better yet DYI, this way you know exactly what you are putting into your gun.