Question on nozzle lengths

[sly mantis]

Hi
Recently picked up some nozzles for a g36 and mp5. i decided to measure them just to confirm and found that they were shorter than i expected them to be from looking online at specs.
The g36 nozzle measured 23.5mm vs 24.3 spec i found online and the mp5 was 18.0mm vs 20.4mm spec. Pics attached, these are shs nozzles.

Im wondering if im either measuring these the wrong way, i got the wrong part, or are there different lengths for different versions of these guns?

Thanks

[Ratters]

G36's use two different lengths long/short
AK's use two different lengths long/short
MP5 series / MP5K, two different lengths long/short

as do many others.

You've already won half the battle by owning vernier calipers.

Best suggestion i can make is always measure the stock nozzle and then order.

send an e-mail first to the seller to confirm long or short version, request a measurement. some forward thinking nozzle makers now laser etch the length into the nozzle, very handy.

in closing, some cylinder heads are also designated as long or short

[RainyEyes]

From my experience... in a nuteshell:

Different brands will have different specs for the same gun.

DO NOT MIX DIFFERENT BRAND PARTS.

For example: G&G Mp5 and Cmya Mp5 although they are the same gun will have a different measurement for the nozzle, gearbox, body, etc.

Another example: sometimes a gearbox's front end will be thicker at the front and that pushes the hop up forward, which results in needing a longer nozzle compared to another gun that has a thinner front.

[sly mantis]

how much contact should there be between the nozzle and the bucking?
im working on a bit of a frankengun right now so im not 100% that the nozzle in it is the correct length.