Just_started

Hi again - yup it does have blowback which was a feature I liked, although I think it makes it a bit less gas efficient and possibly a bit more noisy - I really hadn't realised just how loud a pop these BB guns would make!!
 
It has adjustable hop-up which is access via the case ejection port in the slide when you pull it back to cock it - not that I've tried that yet as I've not used it too much as a bit concerned at worrying the neighbours!
 
The silencer work has gone well - nice little project
 
It's just got the paint drying at the moment and then I'll reconstruct it and post a few pics of it being made.
 
Unfortunately I noticed that the outer barrel of the gun which has the female thread to accept the silencer is actually NOT concentric with the bore of the inner barrel. What this actually means is that as soon as i screw the silencer into place, I can see that it actually points slightly upwards. I guess this is probably due to cheap manufacturing and poor quality control of the outer barrel. Its not my thread and silencer, as it's turned, drilled, threaded all sequentially without removal from the lathe - I couldn't really make it non-concentric even if I tried! When I put the plastic end plug back (that is fitted as standard) in the barrel I can see that it also does not seat correct and true against the end of the outer barrel. This isn't a problem at all if you don't fit a silencer, however it will mean that the BB will simply collide with the sound baffles if I tried it, since the BB is coming out level and the silencer is tilted slightly upwards. I'd imagine that it will also adversely affect the spin on the BB and probably make it super inaccurate if the BB will even make it out, so i haven't even tried it with a BB!
 
This is fixable as I can make an end plug and epoxy a 6mm ID sleeve within it that IS dead inline with the inner barrel, or maybe I just use the gun as it is with no silencer - I can always convert it to fit another BB gun in the future!
 
I'll try and get pics up this evening if I can

That's the one - the CZ75 Compact - feels quite nice - not too plastic feeling and has decent weight to it. Top slide is metal along with the necessary components, then the main body is mostly resin. I have no experience so nothing to gauge it against. The slide and barrel do have a bit of play in them, which I would imagine will affect accuracy a bit, but I'm not sure how accurate these are supposed to be?
 
I'll try and take some pics of the CZ75 and the parts I've been making tomorrow and post them

Nice one, glad you got it sorted!edit: is it the CZ75 Compact you have? Been thinking of one myself, seem a good price for the spec, also any chance ofsome pics of your handiwork?

Hi again,
 
Many thanks to Two_zero and Straffham for your help
 
I tried checking more sites etc, and although I could find silencers and adapters to fit them to certain models, nothing specific to mine so far, neither could I seem to find any specs for the cz75 showing the thread. So I gave up and just cut a custom thread to fit which seems to do the job nicely!
 
It's a male thread with major diameter of 12.55mm, pitch of 1.0mm and metric 60 degree flank angle. An odd mish mash, but it seems to work nicely and fits perfectly in the barrel.

Several pistols have a 11mm female threaded outer barrel, King Arms and SHS do 11mm barrel adapters to accept 14mm threaded standard silencers (though places such as Actionhobbies and Firesupport I've checked in UK seems out of stock, I'm after one for my S&W Sigma grrrr), not 100% sure the CZ75 is the same but would think it likely, I very much doubt it would be an imperial size to be honest.

isn't 14mm crossthread the usual, at least in airsoft? why not look at some airsoft suppressors/suppressor compatible airsofts? try this site:) http://shop.ehobbyasia.com/