[mzo]

I have the Echo 1 LMG/RPK (completely stock) and want to make some basic upgrades to it. Also all my parts will be purchased from GTA stores which limits my options.

I am looking for suggestions regarding (1) which brand to get for each part and (2) if my planned upgrades will really make a difference in terms of overall performance (range, accuracy and rate of fire) and in durability (how long before things are likely to break, not including lemons).

Also I will not be installing the parts, I will have a gun doc at a local store do that deed.

The parts of I want to replace are:
1-Gearbox
2-Motor
3-Hop-up Chamber
4-Hop-up Rubber
5-Inner Barrel

For Gearbox my options are:
-King Arms V3 8mm Bearing Gearbox
-Lonex V3 8mm Enhanced Bearing Gearbox
I am thinking go with the Lonex.

For Motor my options are:
-Tienly GT-35000
-Guarder Infinite Torque
-Lonex A2
-Lonex Durable
-Lonex Titan A1
I am thinking that I should go with one of the Lonex motors.

For Hop-up Chamber my options are:
-Modify Accurate Hop-up
-LCT AK Hop-up Unit
-Lonex Enhanced Hop-up
-Pro-Win AK Hop-up Unit
I figure might as well go with Lonex once more.

For Hop-up Rubber my options are:
-Lonex Hard Type 70 Degree
-Lonex Soft Type 50 Degree
-Mad Bull 60 Degree Normal
-Mad Bull 60 Degree Shark
-Modify Baton Ryusoku Flat Type
-PDI W Hold

For Inner Barrel my options are:
I want a long 6.03 inner barrel and it seems my only option is Modify Hybrid 550mm/590mm/650mm. Will this work?

As you can see all the upgrade parts that I am considering are Lonex, except for the inner barrel. If you think there are better options (from the options I have listed) for a specific part or all parts please let me know. Also please let me know if I am over doing it or doing something wrong, since this my first attempt at an upgrade.