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You need to make some parts choices for yourself...and GBB's are more than finiky, so there's often no "magic parts list" to just drop in and say Tah-Da! Here it works.
Power
- tightbore
- longer inner
- high flow valve on mags
- tight air seal....good mag top seal -> nozzle seal...nozzle tip->hopup...etc...
- float valve weight and spring tension
Accuracy
- gas pressure consistency
- hopup
- inner barrel
- sear/hammer/trigger set
Performance
- weight of recoiling parts
- BBU piston head airseal
- recoil spring tension
- etc...
Reliability
- fit/strength of parts (knockers/disconnects/etc..)
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