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Author Topic: Air Arms T200 Front sight mount, with integral AIR STRIPPER  (Read 170 times))

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Some recent projects inspired me to 3D CAD model the Air Arms T200 (CZ200) front sight mount.  I then created a version that adds a functional air stripper.  See images below, with print file.   In this case, a two stage air stripper that looks a bit like a howitzer muzzle brake.

I can create an S200 version without the sight dovetail.  Also, I can add .22 versions, with and without sight dovetails.  This version is .177.

The print file will generate a threaded hole for the M4 x 0.5 mm retention screw.  I left the thread tight, so chasing it with a tap is advised.

The STL print file for the part shown, is the first file in the attachment list, directly below.  The part must be placed on the printer platen as shown, or it will not print properly.   Turn supports off.  Print at 100% density.
« Last Edit: June 14, 2022, 10:32:34 AM by subscriber »
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Re: Air Arms T200 Front sight mount, with integral AIR STRIPPER
« Reply #1 on: June 15, 2022, 04:05:23 AM »
Muzzle brake Version 1, above looked a little dainty in vertical stiffness, so I added material back to help with that resulting in Version 2.   See images below

The material I added stays within the original stock part OD and length.  So the casual observer might not notice the sight base now incorporates a functional air stripper / brake.

Version 2 lifts the sight dovetail, such that it just falls within the OD of the original sight base OD.  That raises the front sight about 2 mm from stock; which should be within rear sight adjustment range.

The stock part and Version 1 of the brake have a flat bottom, to clear the T200's removable air cylinder.  I kept that clearance, but added material such the flat is turned into a curve.  A small change, but material far from the center line helps a lot with making parts stiffer, to avert potential vertical droop.


EDIT:  After struggling to attach the STL file, I managed to ZIP it - posted in reply #2 below.

 
« Last Edit: June 15, 2022, 04:27:31 AM by subscriber »
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Re: Air Arms T200 Front sight mount, with integral AIR STRIPPER
« Reply #2 on: June 15, 2022, 04:06:25 AM »
V2 STL is 2700 kB.  The max is over 3200 kB, but I system states STL is too large.  So I will try to compress the file...

Success:  ZIP file containing STL is attached.
« Last Edit: June 15, 2022, 04:13:59 AM by subscriber »
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Re: Air Arms T200 Front sight mount, with integral AIR STRIPPER
« Reply #3 on: June 15, 2022, 04:52:40 AM »
Version 3 of this Brake deletes the front sight dovetail.  So, V3 turns the AA S200 "brake" into a brake; while retaining the rounded air tank clearance of V2, over the stock flat bottom.

STL for V3 is attached directly below, as a ZIP file to stay below GTA file size limits:
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Re: Air Arms T200 Front sight mount, with integral AIR STRIPPER
« Reply #4 on: June 15, 2022, 07:21:09 AM »
I created a .22 caliber version of this air stripper for the AA S200.  It has a curved air tank clearance cut underneath, and no front sight dovetail.  Else, the envelope is the same as the stock "muzzle brake".   See images below.

STL file is attached at the bottom of the list of attachments to this post:

« Last Edit: June 15, 2022, 07:31:28 AM by subscriber »
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Re: Air Arms T200 Front sight mount, with integral AIR STRIPPER
« Reply #5 on: June 22, 2022, 06:36:15 AM »
I extended the stock front sight base by 2.5" in length, and 0.275" in diameter.  (now, 135 x 32 mm diameter)  (stock, 71 x 25 mm diameter)

The added length results in 3" of length projecting ahead of the barrel muzzle.   2.3" of the LDC length projects back from the muzzle to create a small reflex expansion space.  This is fed by the air stripper just ahead of the muzzle.

Now, the total size of this LDC may not make it as quiet as some might like.  Yet its short frontal overhang and approximate 50 gram weight make it less obtrusive.   

Could I have designed a functional 25 mm OS LDC, just by stretching it a lot, and used a greater reflex length?  Not in a meaningful way.  Not, if I wanted to keep a functional sight dovetail on it.  Not if I wanted to feed air to the rear via meaningful passages, into a meaningful volume.  Ditto, if you want to be able to remove the air tank, or use an extended air tank.  The tank clearance cut being the bugbear.

The images below compare the sight base LDC against the stock T200 sight base.

STL print file is attached at the top of the list of attachments in ZIP format.  It is for .177.  A version for .22 will follow.

The version of this LDC without a front sight dovetail, does have more expansion volume, and may appeal to people using scopes. 

If there is interest in a longer version of this LDC, I could design one that adds an inch front and rear.  So, then 4" ahead of the muzzle, and 3.3" as reflex length.  The reason for the reflex design is to increase the distance between barrel supports for batter barrel alignment; considering there is no thread and shoulder arrangement.  Only a tight fit at two sections, and a M4 screw at the stock grub screw location.

LDC to be printed with its wide end standing on the printer platen.
« Last Edit: June 22, 2022, 06:47:21 AM by subscriber »
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Re: Air Arms T200 Front sight mount, with integral AIR STRIPPER
« Reply #6 on: June 22, 2022, 07:55:13 AM »
Version of the above LDC, with the sight dovetail deleted.

.177  STL attached as ZIP file directly below.
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Re: Air Arms T200 Front sight mount, with integral AIR STRIPPER
« Reply #7 on: June 22, 2022, 08:16:04 AM »
.22 version of the above S200 LDC.  No sight dovetail.

STL attached as ZIP file directly below.
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Re: Air Arms T200 Front sight mount, with integral AIR STRIPPER
« Reply #8 on: June 22, 2022, 10:44:54 AM »
Notice that all of these designs sport air tank removal clearance cuts:

So, for those that want their 12+ FPE S200 more quiet, I stretched the above .22 version to 7.1", from both ends.  From 135 to 180 mm.

The reflex section is 3" long and the section in front of the muzzle 4.1" long.

The STL is attached below as a ZIP file.
« Last Edit: June 22, 2022, 10:49:26 AM by subscriber »
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Re: Air Arms T200 Front sight mount, with integral AIR STRIPPER
« Reply #9 on: June 22, 2022, 05:43:57 PM »
Those look very nicely designed.
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Re: Air Arms T200 Front sight mount, with integral AIR STRIPPER
« Reply #10 on: June 22, 2022, 08:35:18 PM »
Thanks, Matt
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Re: Air Arms T200 Front sight mount, with integral AIR STRIPPER
« Reply #11 on: June 25, 2022, 09:36:55 PM »
For anyone interested in printing any of these designs, note that you should turn supports off in your slicer.   

Else, unlike the open structures sketched below, supports inside a closed structure are impossible to remove.  So, my designs avoid the need for supports:

There are no slopes off vertical by more than 45 degrees, and mostly they are 30 degrees off vertical or shallower.  So, no supports are required.  In some instances a design ends up with bridges, but I keep those to less than 2 mm.

There is only one orientation that will enable printing these designs to avoid "floating features" (impossible without supports).  That is with the front end of the part standing on the printer platen (assuming FDM or molten filament printing).  See sketch below.
« Last Edit: June 25, 2022, 09:40:13 PM by subscriber »
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