Made a SSG, MDS hammer, and a shorty valve for QB7Xs.



Author Topic: Made a SSG, MDS hammer, and a shorty valve for QB7Xs.  (Read 290 times))

Offline AustinB

  • Marksman
  • ***
  • Posts: 331
  • yes
  • Real Name: Austin
Made a SSG, MDS hammer, and a shorty valve for QB7Xs.
« on: January 05, 2019, 12:01:21 AM »
A few custom QB7X parts I made the other night.

My take on an externally adjustable KISS SSG. Striker distance and preload is adjustable.

A 12.5g MDS hammer.

My custom shorty valve with a Delrin poppet.

The last photo shows the SSG installed on a QBS. I didn't plan this SSG out for a synthetic stock, so I ended up having to modify it a bit for it to fit. The next SSGs will be made to fit all of the rifles with no stock modifications.

I put all these into a .177 QBS regulated at 900 psi. I was able to get anywhere from 0fpe up to 15fpe. At 1100 psi I got up to a Max of 20 fpe. Air usage is excellent, and the report is minimal compared to the stock rifle.
  • Iredell, TX

Online Nvreloader

  • Expert
  • *****
  • Posts: 1449
  • Real Name: Don
Re: Made a SSG, MDS hammer, and a shorty valve for QB7Xs.
« Reply #1 on: January 06, 2019, 01:29:43 PM »
Austin

That looks very nice and well made.

A question for you,,

I am attempting to figure out the adjustment of that Kiss SSG,
Is there another photo showing the parts, before they are put to together,
and in relationship as used?

From the photo,
I think I can see the black end of a threaded piece, what is it attached too?

Can that wing nut be turned around,
so you have a flat surface for the spring to seat against?

On the valve, it looks like the spring is starting to wind around the "E" clip,
do you have any problems with the "E" clip staying on the poppet shaft, during usage?

Thank you,
Don
  • Western  NV
Hammerli 850 Air Mag -17 cal x 2, 22 cal
QB-79 - 22 cal
AF Recon Condor 22 cal- pending
CF 4500 45 min SCBA tanks x 3, w/SB F-10 compressor

"We must reject the idea that every time a law's broken, society is guilty rather than the lawbreaker,
It is time to restore the American precept, that each individual is accountable for their actions."
Ronald Reagan
-----------------------------------------------------
"Speeds fine, but Accuracy is final"

Offline AustinB

  • Marksman
  • ***
  • Posts: 331
  • yes
  • Real Name: Austin
Re: Made a SSG, MDS hammer, and a shorty valve for QB7Xs.
« Reply #2 on: January 07, 2019, 01:16:17 AM »
Austin

That looks very nice and well made.

A question for you,,

I am attempting to figure out the adjustment of that Kiss SSG,
Is there another photo showing the parts, before they are put to together,
and in relationship as used?

From the photo,
I think I can see the black end of a threaded piece, what is it attached too?

Can that wing nut be turned around,
so you have a flat surface for the spring to seat against?

On the valve, it looks like the spring is starting to wind around the "E" clip,
do you have any problems with the "E" clip staying on the poppet shaft, during usage?

Thank you,
Don

Don,

I appreciate the kind words.

Unfortunately I do not have photos preassembly, and the rifle that it went in has been sold.

My goal was to make a SSG that had both fee flight distance adjustment and preload adjustment that could be adjusted externally.

The larger knob is the free flight distance adjuster. The smaller knob is the preload adjuster.

The black piece you see is a piece 5/16-24 allthread that threads into the end cap. It allows about .500" adjustment in the free flight distance. The two nuts on the smaller 10-24 allthread do two things. One is to keep it from popping out the back when the rifle is cocked, and the other is to keep the 5/16-24 allthread from being able to be backed out of the end cap completely.

The 5/16-24 allthread is drilled out to .190 to allow the 10-24 preload adjustment threaded rod to pass through it.

The wing nut can be turned around, I believe it was before I installed it.

I think you can see it in the photo, but the breech did have to be drilled for a screw so it could faxstened to the rifle.

I'm going to do another one my next day off. I'll snap photos showing the relationship of everything before assembly.

I shot around 500-600 shots with this valve stem and didn't lose a c clip. The first stem I made, I cut the groove a hair too deep, and lost a c clip.

Thank you,
Austin
« Last Edit: January 07, 2019, 01:24:35 AM by AustinB »
  • Iredell, TX

Offline AustinB

  • Marksman
  • ***
  • Posts: 331
  • yes
  • Real Name: Austin
Re: Made a SSG, MDS hammer, and a shorty valve for QB7Xs.
« Reply #3 on: January 11, 2019, 05:00:07 AM »
Didn't make another one for a QB, but this one is for a P12.

Same idea, except this one has to be removed to change the preload.

The threads hanging out the back is because I was too lazy to swap gears on the lathe for M18-.7 so I just went with 18tpi.

The photo shows it set for 28fpe. Just adjusting the throw distance can get this one up to 38fpe.

It's just small enough not to actually hit my shoulder.
  • Iredell, TX

Online Nvreloader

  • Expert
  • *****
  • Posts: 1449
  • Real Name: Don
Re: Made a SSG, MDS hammer, and a shorty valve for QB7Xs.
« Reply #4 on: January 11, 2019, 06:33:30 PM »
Thanks Austin

I have tried several times, to use the drive on types , "C" types and "E" clips, correct size for the shaft size,
and cannot keep them on the poppet shaft, and I don't know why, they won't stay attached.
 
I used the lathe and even cut a very sharp parallel grove about .005-.006" deep,
the clip could barely turn and did snap into the groove, with resistance,
using a pen spring on the last poppet shaft and had the clip come off.

So I gave up, I must be doing something wrong somewhere........... ::)

Great work......... 8)

Have you thought about using a flat spring for the SSG, lots of options and plenty of power,
no coil spring stacking, and with very lite bolt cocking effort as compared to a normal coil spring?

Thanks,
Don
  • Western  NV
Hammerli 850 Air Mag -17 cal x 2, 22 cal
QB-79 - 22 cal
AF Recon Condor 22 cal- pending
CF 4500 45 min SCBA tanks x 3, w/SB F-10 compressor

"We must reject the idea that every time a law's broken, society is guilty rather than the lawbreaker,
It is time to restore the American precept, that each individual is accountable for their actions."
Ronald Reagan
-----------------------------------------------------
"Speeds fine, but Accuracy is final"

Offline AustinB

  • Marksman
  • ***
  • Posts: 331
  • yes
  • Real Name: Austin
Re: Made a SSG, MDS hammer, and a shorty valve for QB7Xs.
« Reply #5 on: January 11, 2019, 07:58:55 PM »
Don,

I cut the groove for my c clips by about .003" over. Takes some force to install them, and they're probably only good for one install, but they definitely stay on there.

I've been reading the threads about the flat springs. One thing I don't understand is how the flat springs compress easier. I assumed a 10#/in spring is the same no matter the shape. Maybe they have different measurement systems?

Right now, I've got about 5ft of a few different springs I need to use up before I think about anything else.

Thanks,
Austin
« Last Edit: January 12, 2019, 09:01:41 AM by AustinB »
  • Iredell, TX

Offline AustinB

  • Marksman
  • ***
  • Posts: 331
  • yes
  • Real Name: Austin
Re: Made a SSG, MDS hammer, and a shorty valve for QB7Xs.
« Reply #6 on: January 11, 2019, 08:18:12 PM »
Just read the last few posts on the flat springs. I believe I have a grasp on it now.
  • Iredell, TX

Online Nvreloader

  • Expert
  • *****
  • Posts: 1449
  • Real Name: Don
Re: Made a SSG, MDS hammer, and a shorty valve for QB7Xs.
« Reply #7 on: January 12, 2019, 01:34:37 AM »
Austin

Thanks for the info on those clips, sounds like I was making the groove too deep,
I'll have to try again, as I want to shorten the valve as much as possible,
I have over 290+ of those clips in push on, "C" and "E" styles......... ::)

The way these flat springs are made, is the thickness and the width of the spring coil, ie,
a 17# spring is .028" thick and .070" width (flat part of the spring) by whatever number of coils.
this 17# spring, 6" long will compress to 1.030", before becoming coil bound etc.

You can't do that with an equal 17# round wire spring...LOL

Tia,
Don
  • Western  NV
Hammerli 850 Air Mag -17 cal x 2, 22 cal
QB-79 - 22 cal
AF Recon Condor 22 cal- pending
CF 4500 45 min SCBA tanks x 3, w/SB F-10 compressor

"We must reject the idea that every time a law's broken, society is guilty rather than the lawbreaker,
It is time to restore the American precept, that each individual is accountable for their actions."
Ronald Reagan
-----------------------------------------------------
"Speeds fine, but Accuracy is final"

Offline HunterWhite

  • Hunter Whitebeard
  • Sharp Shooter
  • ****
  • Posts: 870
  • Santa with his granddaughter
  • Real Name: Hunter
Re: Made a SSG, MDS hammer, and a shorty valve for QB7Xs.
« Reply #8 on: January 12, 2019, 12:33:50 PM »
That looks really nice Austin.  I am going to try to do this on a crosman 2240. I don't have a lathe so I'm  going to start with a Mellonair power adjuster.
  • Arlington Texas
When does Santa qualify for air miles? 😎

GTA - What's been your success with air gun target practice?
 

Sponsored Ad: