fps boost?

[CES_williamson]

i noticed at my most recent skirmish that the fps on my kwa m4a1 has dropped massively it is now at the 230-235 mark and it is meant to be around 300 so my friend has had a look at it and says that it is not the seals around the piston. i am wondering if the spring has worn down?

any help would be great

thanks charlie.

 

[Liam Porter]

It could be the spring. When you last used it, did you do the last shot on semi to complete the cycle? If not, then it may have been mid-cycle, meaning the spring has been left compressed since last time. This would obviously mean it's not going to be the same power as it was before.

 

[kungfumonkey]

It could be the spring. When you last used it, did you do the last shot on semi to complete the cycle? If not, then it may have been mid-cycle, meaning the spring has been left compressed since last time. This would obviously mean it's not going to be the same power as it was before.

Click to shrink...

i normal look into the hop n give a quick burst on full till i see the air nozzle fully in the hop chamber as semi allways seems to have it back and the feed tube clear? or am i doing it backwards?

 

[Liam Porter]

Semi will always end the cycle with the spring at the least compressed it can be.

I think when the nozzle's forward, it means the gun's ready to fire (compressed spring), because it should be pushed against the BB, to reduce the air loss.

 

[kungfumonkey]

right i been doing it backwards then lol opps

just watched this and my air nozzle sits back when fireing on semi not forward like this shows ?

 

[Liam Porter]

Eh, no idea then. Something to do with the tappet plate and sector gear. If the guns shoots fine then I wouldn't worry about it. Still, last shot on semi as it decompressed the spring.

 

[kungfumonkey]

yeh had no issues with it and had bout 3000 rounds through it miss fed for a wee while but that was due to me not seating the new bucking correctly once i seated it proper its been fine ever since.