Yea it is as AR’s have a cutout in the faux slide that the ping pong paddle locks in to.
MP5’s are a different kettle of fish and don’t do ping pong.
Traditionally they close on an empty chamber and you manually lock the bolt back, insert fresh mag, then dance around in circles yelling look I’m doing the H&K slap 
The low FPS will largely be because the KA SAAs and Pythons are green gas BME. Most other revolvers are C02 - which as we know has more ‘punch’.
I was also told the shells were not adapting properly…
The manufacturer was going to release a fix…but didn’t.
Hence, lower fps.
The rubber bushings/grommets in the rear of the shells will need a trim with a new razor-blade, as they tend to bind the cylinder slightly if left as they are.
A/SMike seems happy enough with the Buntline KA SAA though.
Cheers… I forgot all about Airsoft Mike! 
Very nice… Any MP5K makes a very cool CQB platform. The more you add, the better they look. 
Metal gearbox.?
I thought it was nylon gearbox, with metal gears.?
Are you gonna do, a quick review of it.?
Couple of “new” cheapy AUGs at Xforce.
Must be a Gen8, full auto only and they takes Gen8 mags, not the proper AUG waffle mags.
Wonder how creaky the shell is being a sub $200 blasters.
I’d say it would be good as just a wall hanger except no waffle mag 
.
There was also a “new” CYMA MP5 kit that had the collapsing stock and the full length fixed stock but that’s hiding somewhere on their site, link was on FB.
Found the MP5
CYMA JUND MP5 Gel Blaster – Complete Value Package | X-Force Tactical
That is tempting to add to the stable. Watch out CC
BLG hey, I think @Wombat runs a few of those AUGs 
Mine are the old screw together modded with gen8 gearbox
The x-force ones look a bit different but can’t tell without a RHS view. I’ll have a look later in the week
From the look of the mag release and push though gearbox lock, they could be LeHui without the mosfet for semi and burst
Yea they are the old BLG one
I got the JG Works Aug A3 from ausgel when they had them on special for $150
out of stock at ausgel
Goes well stock standard
Err, i don’t have a fps measuring thingy, but i gotta say it’s okay-ish out of the box, but definitely needs a reshim. Air compression is pretty nice, piston is made from the cheap white plastic, not the sturdy blue shs one.
But as i said, the pinion and bevel mesh adjustment is a pain since you have to guess, and the wiring can get in the way when putting it back together.
I got the metal gearbox one, black color, not split like hk416c and hk416d. So it can withstand m100 spring and not warp like the other metal one from sijun.
Nope, not guesswork… that rarely works out.
You set the pinion height and crown wheel mesh on a V3 box the same way you do it on a Gen 8.
The sijun mp5k uses a v2 gearbox, so it’s not very easy for me to set the correct pinion and bevel height, sadly.
There is always a way, might not be easy. Think outside the box.
Throwing it out there to use marking dye, bolt it up and you’ll see mesh on pull apart and give you an idea where to go.
Hey if I had to use it and get covered in it on 600t presses to check mesh, it could work 
Paint marker pens, mechanics use it all the time to set car diff mesh as they can’t see it either.
If it is a V2 they are easy to set, just got to do few trial runs and get a feel and see what is going on. Don’t rush it.
V2 you set your pinion height with the gearbox split in halves, lay it in one half then you can set your pinion height. You can do it with the halves together but that comes with experience.
I’m guessing you are trying to do it with the gearbox halves bolted together. Not the way.
Hope that helps anyway.
As @Maiphut says, just gotta do some thinking!
If you have a set of vernier calipers it is easy.
Measure the pinion from the end to the lower edge of the teeth.
Install bevel in gearbox, measure from gearbox edge to bevel edge.
Add the pinion teeth length to the gearbox to bevel edge measurement. At this point I normally lock my vernier in place.
Then install motor in lower, measure the top of the pinion to the top of the grip area, adjust motor until it is the same as the pinion teeth length + distance from gearbox edge to bevel edge.
Then you can install the gearbox with only the bevel gear, install the motor and check the mesh with something reaching down to rock the bevel gear.
It’s the same result. but without being able to see it in the half shell method. I actually do this on a lot of gearboxes now as it is quicker if the gearbox is hard to get a good view of the gear edges.
There’s a good method I didn’t know about. Learning again
So BME, that’s a definite that KA weren’t going to change the FPS, you got message from WAT?
