Low FPS

[Alimcd]

Did we ever investigate the valve in the nozzle?

 

[Adolf Hamster]

i'm assuming so, he said he'd replaced the nozzle assembly which suggests a new float valve too?

 

[Misery]

so far shes had xomplete nozzle assembly bbu and an autobotbucking done

float valve which part is that exactly bud still getting to grips with names of the parts

 

[Adolf Hamster]

so far shes had xomplete nozzle assembly bbu and an autobotbucking done

float valve which part is that exactly bud still getting to grips with names of the parts

Float valve=the little plastic valve on a spring that's inside the nozzle, sometimes also called a rocket valve

It directs gas forwards down the barrel then closes, sealing the cylinder so it can cycle.

this could be the cause of low fps, if the spring is weak/damaged/been cut, or the valve is sticking and not resetting then the valve will close too easily, cutting off gas supply early.

eg if you've ever heard of an "npas" kit for a gbbr this is basically an adjustable float valve.

there are aftermarket versions- high flow/low flow valves and springs of various strengths, but very easy to totally fuck up a gun by changing them if you don't know what you're doing so my general philosophy is leave it stock.

depending on the manufacturer this should have come as part of the nozzle assembly- you'd know if you changed it as it'll be the gubbins that goes inside the nozzle. if the new nozzle came with a new float valve then we can probably rule out that being the cause of the issue.

 

[Misery]

ahhh got ya if u had said rocket valve haha so many diff names for parts lol

well def rule that out as was full nozzle kit so that was replaced

yeah dont think ill go down the npas route

nightmare trying to figure this gun out lol

 

[Adolf Hamster]

ahhh got ya if u had said rocket valve haha so many diff names for parts lol

well def rule that out as was full nozzle kit so that was replaced

yeah dont think ill go down the npas route

nightmare trying to figure this gun out lol

npas is mostly for gbbr's to get them dialed down to a specific limit, not really much call for using them in pistols as with a few exceptions they tend to be far enough below our power limits.

sadly that's the gbb life, part of the reason it's a standard reccommendation not to jump straight into airsoft with a gbbr.

i'm struggling to think what else to look at. we've cleared the hop, nozzle, bbu and mag router, i'm assuming you didn't find anything of note in the trigger mech that was worn/jamming.

did you mention what gas you were using? if you're using a lower powered gas try higher powered, but also the reverse if you're already using a higher powered gas.

a higher pressure gas can drop fps by making the valve on the magazine too hard to open for the hammer setup (essentially light striking).

there's also the hammer spring, did you try the bb under the mainspring?

only other thing i can think is when you're chrono'ing is the hop turned on? the bb needs a little resistance to help it build up backpressure before it starts moving.

 

[Nick G]

Has anybody mentioned temperature ? how warm are the mags when you use them ? A cold mag makes a hell of a difference to fps. Just been out testing my boneyard combat master and the difference between a cold mag and one thats been in my pocket for a while is night and day in terms of kick.

Nick

 

[Misery]

erm ive made a complete and utter feck up...the pistol was never low fps my fecking chrono was set to m/s instead of fps only figured it out cause step son wanted to do his lol and his came up at 80 odd was like hold on cant be right,tried my shotty through it 44 the noticed was on ms lol achwell got spare parts for when she does go

was in a warm housee bud so mags were upto decent temp but was my own fecking fault lol

thank you @Adolf Hamster and @Alimcdfor alll the help!!

View attachment 69803

 

[Adolf Hamster]

haha, was not expecting that one, no wonder nothing helped.....

at least the work isn't wasted, a learning experience is always good. guess that means the original nozzle maybe was good after all so now you've got spares.

 

[Misery]

haha me neither llf

totally bud,yup have put alol the original parts back in and keeping the new ones for the spares may pick up another as see these as boneyards quite often lol

 

[Adolf Hamster]

Yeah, good to have.

I have about 4 makarov loading nozzles, and thats not including the ones in the gun.....

In my defence i figured better grab em while they were around.

 

[Misery]

aye man always good having spares

whys that bud thought makorovs were quite popular

i just cant beleive after all that it was the fecking chrono!! if wasnt for my step son wanting to see what his can do id never of checked!!! although did accidently shoot myself in the toe haha fecking hurt like a **** lol proper tear to the eye moment haha

 

[Nick G]

That's a great result though ?

 

[Alimcd]

You know what, I actually thought about that earlier but I thought:

A: You’ve run an M4 through the same chrono

B: 100m/s is 330fps, so likely a bit high for green gas

Who’d have known!

 

[Adolf Hamster]

whys that bud thought makorovs were quite popular

ahh so my secret propaganda campaign is working then.......

tbh i've owned more makarovs than i've seen in the wild, and i've owned 3.....

the WE version is a nice little gat, and i have a thing about small handguns.

i wonder if the rarity is due to 007 fanboys picking them up thinking they're ppk's

You know what, I actually thought about that earlier

oh aye, you say that now.....

100m/s is 330fps, so likely a bit high for green gas

yeah, it's a big higher than i'm used to seeing from pistols, but hovering around the 1j mark is pretty respectable for a handgun.

 

[Misery]

it was shooting 315 on ultrair according to patrol bases test before sending out to previous owner

View attachment 69815

You know what, I actually thought about that earlier but I thought:

A: You’ve run an M4 through the same chrono

what would running a m4 through it cause?

 

[Misery]

the offending pistol lol not bad for 60  i will admit to removing the paint but i was only in my defense i was only trying to remove the blue over the trades then got carried away and forgot to stop ? she was then given a couple of coats of matt black on the slide to cover the last of the blue that i couldnt remove,2 extra mags were ordered from bespoke the same day i bought the pistol so with the pistols and mags and autobot bucking im a grand total of 110 in +15 in parts that were not needed so writing em off haha,but im happy and thats all that matters  onto the next *project* haha

View attachment 69816

View attachment 69817

 

[Adolf Hamster]

what would running a m4 through it cause?

he means that because you were getting proper readings when working on your m4 that the chrono was setup for fps.

needless to say we all got fooled with that one......

tbh for a pistol you can deal with anything 0.5j and over.

 

[Misery]

ahhh got ya nah was when i seen step sons reading so low was when i questioned wtf is going on and looked properly and saw my mistake lol `first thing i did was load the pistol and try bout jumped for joy then sheepishly put the pistol away and let u guys know lol

 

[Misery]

Ok so from day one ive always had the issue of it pissing a bit more gas out than it should on the blow back in my opinion. and then found out it not being able to shoot a full 30rounds out a mag i was putting down to just temps etc couldnt sleep so decided to tear it down clean relube checked the rocket valve spring and low and behold the spring was weak as s**t when i tested before i musta tested the new nozzle twice and not the old one haha slapped the new nozzle and rocket valve in and holy crap she is alot more snapier and hardly any gas expelled!