||For the price of this gun it is truly amazing.
I've put javelin/systema/jg/G&G parts into this gun and it's super compatible past Classic Army parts.
Even the Javelin gearbox required nearly 0 modification while on other classic army rifles it's requires heavy modification.
This would be my #1 recommendation for a base gun if your making a custom.
I PUT THIS GUN THROUGH A STRESS TEST!
I put an 11.1 LIPO battery and shot 2,000 rounds on Semi and Full auto when this was gun was STOCK.
They werent consecutive but thats still pretty amazing.
This was before any upgraded parts.
The only failure after 2,000 rounds was the motor... though the gearbox sounded as if it would blow up any second.
Conclusion: Great base gun, Dont use with a lipo though. If your making a custom i would recommend getting this.
Note: The barrel of this gun is a special aluminum metal that alone is worth half this gun ($60)
Only problem is the pinion which i had to replace after about 200 shots when i was using my 9.6