- consistent compression...is utmost...if each shot is coming out at a different velocity then what's the point?
- consistent hopup application...good rubber...hopup unit that doesn't lose its setting
- good BBs...good finish, consistent size/weight
- 0.25g min...0.28/0.30's are very consistent
- keep it under 350-360fps w/ 0.20's...seems to be a real sweet spot for a lot of setups
- good inner barrel...again, for consistency
- barrel length is (no offense to anyone) immaterial within some reason...I've got a CQBR setup that out ranges (for effective accuracy) bolt guns and many other AEGs...I've had longer setups that shot like hummers too. I've had pistols that could put predicable shots 60ft out. If you get the other items above sorted out....you'll find barrel length not as important. 6.03-6.04mm tightbore is plenty nice if it's a good make.
Not sure what you mean by "knockdown power"...but heavier BBs will smack harder than light BBs. Sound, and felt impact. But realistically you're not going to "knockdown" much more than tin cans with an AEG. (you can shoot up apples and stuff...but you know what I mean re. the power levels of these things).
Now...if you're shooting a PTW Super Max with the silver cylinder...then you're in a different magnitude of power class from run of the mill AEGs. Stil...won't shoot through steel plates or anything like that...
