The Stryfe and Stockade probably have loose motor mounts that rattle when revving. Since you said the screws were already tight, they are probably defective. I suggest going to the store and exchanging them for others.
Longstrikes always have poor range, but yours seems to have abnormally low ranges. You should probably try opening it up to see if there is anything wrong with it. Also, the sounds you described it making are very unclear.
Pictures of the internals of these blasters would greatly help us. It is usually required for us to figure out what is wrong with it.
Ill try using some other screws and see if it works, I just thought it might have been a common problem on some of the guns with motors.
Sorry I cant describe the sound better on the longstrike, it just doesnt sound or feel like a real nerf gun. I think 20-25 feet is a bit more accurate, but it just still seems awfully weak.
Why make the longest gun and call it a LONGSTRIKE, when my maverick is that much smaller and shoots twice as long?
Besides getting a scope, extra mag and a barrel thats fits really poorly on the stryfe, I feel like I have been robbed by hasbro

Atleast I can try mod it and not care about it if it breaks!