SPA M11 (M22) conversion to 0.30
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SPA M11 (M22) conversion to 0.30
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Topic: SPA M11 (M22) conversion to 0.30 (Read 3492 times - 1 votes)
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paran
Shooter
Posts: 39
yes
Real Name: Panagis
SPA M11 (M22) conversion to 0.30
«
on:
March 24, 2020, 04:30:57 AM »
good morning from the not infected yet Kefalonia Island, West Greece,
My first winter project this season was the lightest full size PCP in the world, based on a SPA PR900W.
My second project was a conversion of a SPA M11 (M22) from .25 to .30 cal.
I bought the gun new, from the Greek market. They sell it under ARTEMIS brand, as M11, but its the same exactly gun sold as M22 in the rest world markets...
Its a very good quality gun, very well made, with some minor issues as it is.
Its a rear bolt, regulated, aluminum HPA tank (250 cc, 250 bar), with hammer spring tension adjuster and full shrouded gun...
Here are a lot of photos of the gun, for those who don't know it...
The gun is holding to the stock with two allen screws (M6 on the rear post and M5 on the barrel band)...
The gun sold with a full length shroud, with aluminum baffles...
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Kefalonia Island, Ionian Sea, GREECE
to the deepest limits...
paran
Shooter
Posts: 39
yes
Real Name: Panagis
Re: SPA M11 (M22) conversion to 0.30
«
Reply #1 on:
March 24, 2020, 04:52:24 AM »
I shot less than twenty shots as it was (0.25). The gun was very silent and i didn't measure velocities and autonomy, because the project was a
conversion to 0.30
...
First i constructed in my small lathe,
an original version SSG for my gun, with 3 mm inox shaft and almost 9 mm capability of moving back and forward...
In this gun you can see very clear the free gap between hammer and valve pin from the aeration hole in the rear aluminum tube...
To keep the adjustment of the SSG fixed, I put a vertical allen screw in the factory rear piece, with a small cylinder of nylon between...
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Kefalonia Island, Ionian Sea, GREECE
to the deepest limits...
Wayne52
GTA Senior Contributor
Posts: 31841
Gone but not forgotten!!!
Real Name: Wayne
Re: SPA M11 (M22) conversion to 0.30
«
Reply #2 on:
March 24, 2020, 04:58:24 AM »
I have the M11 myself, mine has a choked barrel on it and I think I'm going to order a TJ barrel for it in .257. Mine shoots 34.5 grain NOE Hunter Magnums excellent but won't shoot slugs accurately, they're all over the place.
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paran
Shooter
Posts: 39
yes
Real Name: Panagis
Re: SPA M11 (M22) conversion to 0.30
«
Reply #3 on:
March 24, 2020, 05:04:27 AM »
the very well made factory valve of the gun was in there...
And the regulator was in front of the more than 30 cc plenum...
The valve poppet (teflon) diameter was 8 mm and the valve pin was 3 mm...
In the valve block there is also a very useful screw to empty the HPA tank...
Here is the regulator...
The valve intake diameter was 6 mm...
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Kefalonia Island, Ionian Sea, GREECE
to the deepest limits...
paran
Shooter
Posts: 39
yes
Real Name: Panagis
Re: SPA M11 (M22) conversion to 0.30
«
Reply #4 on:
March 24, 2020, 05:42:02 AM »
It was the time to construct a balanced valve small enough to fit in the given factory space. I constructed three different valves until find the proper one. It was not possible to find Ketron Peek 1000 in my country, so my first attempts was with black acetal... All the acetal designs were malfunctioned after some dozens shots, giving valve locks (that's why the relief screw was so useful...
)
the final version of my balanced valve was a bronze one and the gun now is working without any kind of problem with this valve...
I opened up the valve throat to 7 mm...
And the transfer throat to 6 mm...
This design work for almost two dozens of shots and then the acetal which was press fit in its place moved in the valve pin and gave me a very nice valve lock. the hammer strike the valve pin and move the valve forward, but the acetal part keep the valve closed...
I changed the design with a modified acetal part (the blue one) and this valve work for fifty maybe shots but suddenly the acetal broke and i had once again valve lock...
After the second fail I construct very carefully and very precisely a brass poppet for my balanced valve and using some very fine metal polish gel I pair very well the valve poppet with the valve body. After some search with the valve spring I decide finally to
use my balanced valve without spring. That means a little trouble to fill the empty gun, but after that it works just perfect...
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Kefalonia Island, Ionian Sea, GREECE
to the deepest limits...
paran
Shooter
Posts: 39
yes
Real Name: Panagis
Re: SPA M11 (M22) conversion to 0.30
«
Reply #5 on:
March 24, 2020, 06:09:41 AM »
My 0.30 barrel was a blank Spanish one, 65 cm long. I never measure the twist rate of this barrel but the final results were VERY good...
To fit the barrel to my guns breech I need the help of my machinist friend, because my small lathe is not precise enough...
I took in my hands a barrel which fits very nice to the aluminum breech and ready to use the factory shroud...
As you can see there are not o-ring grooves to the barrel. That is because I decide to seal the transfer port directly to the barrel and not to the breech...
That means that the top face of the transfer port (internal diameter 6 mm) is not flat, but it is shaped like the barrel...
The barrel port is an elongated 5.5 by 6.5 mm with rounded front "lip" to smooth the air flow as much as possible...
The front part of my barrel is stepped, to fit with the factory shroud. To be safe I changed the plastic "star" with a bronze one, with a lot better "flow" than the factory one...
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rkr
GTA Senior Contributor
Posts: 4343
Re: SPA M11 (M22) conversion to 0.30
«
Reply #6 on:
March 24, 2020, 06:34:18 AM »
How long pellets/bullets can you fit in that magazine?
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paran
Shooter
Posts: 39
yes
Real Name: Panagis
Re: SPA M11 (M22) conversion to 0.30
«
Reply #7 on:
March 24, 2020, 06:38:43 AM »
I liked so much Bob's idea of the
moving back bolt after put the pellet in the proper position
in the barrels chamber, leaving the airflow unobstructed, so
I decide that the rear bolt of my gun would be like this...
First of all I modified with a carbide bit on a dremel, the breech to give to the bolt the capability to move front the proper length...
A small modify was necessary to be done to the rear aluminum tube also...
After this modify, the bolt can move forward almost 8 mm to set the pellet deep enough to the chamber and then moving back locking in the factory place, ready to shoot...
After that I construct a flat new front end for my pellet probe...
Please look how nice the flat pellet probe push the pellet to the chamber of the gun...
And here is my pellet probe when it is in the secured place (rear one) leaving the air flow absolutely free...
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Kefalonia Island, Ionian Sea, GREECE
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paran
Shooter
Posts: 39
yes
Real Name: Panagis
Re: SPA M11 (M22) conversion to 0.30
«
Reply #8 on:
March 24, 2020, 06:42:59 AM »
Forgot to mention that the blank barrel had no chamber, so I had to do it. Based on Bob's chamber reamers, I construct very carefully the proper reamer (7.85 mm) and I did an almost perfect chamber to my barrel. I haven't pictures of the reamer unfortunately, but you can search in Bob's workshop about...
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paran
Shooter
Posts: 39
yes
Real Name: Panagis
Re: SPA M11 (M22) conversion to 0.30
«
Reply #9 on:
March 24, 2020, 06:54:53 AM »
A difficult enough problem was to construct a finger rotating six shot loader for this gun, in the factory space...
To keep the loader perfectly aligned with the pellet probe I put a "spring" of 0.8 mm inox steel and i did small "ramps" in the outer diameter of the bronze part...
The maximum length of pellet/bullet for this loader is 10.5 mm...
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to the deepest limits...
paran
Shooter
Posts: 39
yes
Real Name: Panagis
Re: SPA M11 (M22) conversion to 0.30
«
Reply #10 on:
March 24, 2020, 07:03:51 AM »
During the several tests, I had to
modify a little bit the factory wooden stock
(nice enough wood...) to accept the SSG and my hand over it. I didn't care about this stock, because from the beginning
I had decided to construct a carbon fiber stock for this gun...
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Kefalonia Island, Ionian Sea, GREECE
to the deepest limits...
paran
Shooter
Posts: 39
yes
Real Name: Panagis
Re: SPA M11 (M22) conversion to 0.30
«
Reply #11 on:
March 24, 2020, 07:11:55 AM »
For my safety I changed the M5 factory allen screw in the bolt, with a reinforced one, because in any case this screw breaks during a shot, the bolt would come directly to my nose...
I constructed the new one from high quality inox steel (
Uddeholm Corrax
) which can reach 50 HRC after heat treatment...
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Kefalonia Island, Ionian Sea, GREECE
to the deepest limits...
paran
Shooter
Posts: 39
yes
Real Name: Panagis
Re: SPA M11 (M22) conversion to 0.30
«
Reply #12 on:
March 24, 2020, 07:35:42 AM »
I started test the gun with the wooden stock.
First of all i checked the possibility to move a little up the factory regulator, which was set to 130 bar. Without many more words, but after some tries
this unit can regulate until 145-150 bar. I set it there and I search a little the hammer spring...
The factory hammer spring was not enough to open properly even my balanced valve
, so I search the local car service stores for some replacement...
The "right" one was from an oil pump from an ancient Ford diesel engine...
Top the factory one, in the middle a galvanized "not enough" and mounted in my SSG the proper one from the old Ford truck engine...
After some tests and with the free hammer move adjusted by the SSG to 8 mm, with a fill of 210 bar (that was the remaining of my scuba tank...) with the heavy JSB pellets, my 0.30 gave the following...
From 210 bar it gives nine very well regulated shots at 87 fpe and four-five unregulated "useful" shots...
I measure the real air quantity of the HPA tank and
I found it 232 cc
, instead of the 250 factory claim...
Now, after almost two hundred shots, with some minor SSG adjustment, with a fill of 250 bar the gun gives now 18 regulated shots at 90 fpe with the heavy JSB and the "useful" four-five after...
Not bad at all...
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Rocker1
Administrator
GTA Senior Contributor
Posts: 4747
Executive administrator
Real Name: David
Re: SPA M11 (M22) conversion to 0.30
«
Reply #13 on:
March 24, 2020, 07:49:10 AM »
Wow My friend if some one doesnt learn something from this, thanks for your time really good stuff. David
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paran
Shooter
Posts: 39
yes
Real Name: Panagis
Re: SPA M11 (M22) conversion to 0.30
«
Reply #14 on:
March 24, 2020, 08:23:08 AM »
It was time to start the
carbon fiber stock
...
The easiest way to go was to cover with some layers of carbon fiber cloth a properly shaped
hard PVC core
. I had some 12 mm thick PVC remaining from some other project, so
I cut four layers of it and glue it together with epoxy resin
...
From the several types of carbon fiber clothes I had, I choose a 200 grams per Sq. m. plain one...
Fisrt using a home made mold I construct the base of the gun and the SSG, in the PVC foam...
And after I did the proper slots for the trigger the regulator barometer and the post between them...
I started to make the shape of my thumbhole stock very carefully with the dremel sand drums and with sandpaper by the hand...
In the mean time I checked the gun with some of my scopes to see how it seems...
The HAWKE 4x32 was too small for this very long gun...
But the Nikko Strirling nighteater 4-16x44 was nice on it...
Cutting the proper pieces of carbon cloth, i started to cover the PVC foam. First of all the "details" where it is difficult for the big pieces of clothe to cover properly...
Another one test to be sure that everything is OK...
BE VERY CAREFUL WHEN YOU HANDLE AND TRIM/SANDPAPER CARBON FIBER AND RESINS... BE PROTECTED, USE PROPER MASK IN A WELL VENTILATED AREA...
In the butt and also in the front edge i used 10 layers of carbon fabric to reinforced the stock...
With the low temperature the only solution to speed up the process is to use the heat of a common lamp...
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Kefalonia Island, Ionian Sea, GREECE
to the deepest limits...
paran
Shooter
Posts: 39
yes
Real Name: Panagis
Re: SPA M11 (M22) conversion to 0.30
«
Reply #15 on:
March 24, 2020, 08:43:05 AM »
Putting some layers of fabric around an aluminum tube covered by wax, I constructed a piece of carbon fiber tube...
Be prepared to use a lot of sand paper and a LOT of time to do the job properly...
It was the time for the first "long" layers of carbon fiber fabrics...
And after some more sanding the time for the last layers. In the sides of the gun i decide that it is more than enough three layers of the same plain 200 gr/sq.m fabric...
I sand it until 320 wet paper...
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Kefalonia Island, Ionian Sea, GREECE
to the deepest limits...
paran
Shooter
Posts: 39
yes
Real Name: Panagis
Re: SPA M11 (M22) conversion to 0.30
«
Reply #16 on:
March 24, 2020, 09:20:32 AM »
The gun came without any protection for the fill hole, so I constructed from a small piece of aluminum a pin to cover the hole and protect it from dust and dirt...
This is my 0.30 SPA M11 (M22), before the clear mat varnish...
Best of all is that you can wash the stock with water and soap without any fear...
To cover the space between the factory shroud and the breech, I constructed another piece of carbon fiber tube with the same outer diameter with the shroud (25 mm)...
the weight of my carbon fiber stock painted with the mat clear varnish, is almost 450 grams and the rest of the gun is almost 3050,
total 3.5 kilos...
Not bad at all...
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Kefalonia Island, Ionian Sea, GREECE
to the deepest limits...
paran
Shooter
Posts: 39
yes
Real Name: Panagis
Re: SPA M11 (M22) conversion to 0.30
«
Reply #17 on:
March 24, 2020, 09:54:48 AM »
Talking about accuracy I have results until the 48 meters of my backyard. My barrel likes the same the heavy JSB's and my
homemade hollow point bullets
making 1.5-2.0 centimeter groups at 48 meters distance with both...
It doesn't like so much the 0.30 polymag, but i really don't care about it, because I am not hunting...
Based to the GMI engineering swagging kit (It is almost impossible to import it with a reasonable price from India to Greece...) i constructed a same philosophy swagging kit for my gun, made from common carbon steel (1095)...
I did the swagging cores using another home made mold 6 mm diameter, adjusted at 12.5 mm length, it means 3.8 gramms, using a "spoon" for the melted lead, to do the job easier...
with my mold i need about three quarter of an hour to make 150 swagging cores...
In the beginning I use a hammer to do the bullets, but after some I decide to construct a small press to do the job with better results...
The procedure is almost the same with the others swagging kits...
My home made bullets are between 3.73 and 3.79 grams, it means around 58 grains. The diameter of the base is 7.63 mm and the length is 10.5 mm. Take a look please at my home made ammo...
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paran
Shooter
Posts: 39
yes
Real Name: Panagis
Re: SPA M11 (M22) conversion to 0.30
«
Reply #18 on:
March 24, 2020, 10:06:46 AM »
I named my gun "
THE PEACEMAKER
" honored the most famous six bullet pistol, the Colt Peacemaker...
I have to tell first of all many thanks to the Greek airgun forum I am member, the famous
http://wfks.gr/
and the boys there who helped a lot giving ideas (the topic of the Peacemaker -in Greek- is here
http://wfks.gr/index.php?topic=11956.0
...)
I have to thanks "our" Bob Sterne also, because his technical articles posted here, gave me the inspiration to do the SSG, the retracting pellet probe and the balanced valve to my gun...
PS.
Please be VERY-VERY careful with the corona virus. In the nearby Italy a real tragedy happens now, with many thousands of dead people. In Greek mainland the virus spread like a fire... Nobody is really safe, so please hear to the doctors and keep yourself very well protected...
«
Last Edit: March 24, 2020, 10:36:38 AM by paran
»
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chuckinohio
Charles,Charlie, Chuck, or 'Hey You'.
Expert
Posts: 1706
Still trying to make sense of it all.........
Real Name: Charles Richmond
Re: SPA M11 (M22) conversion to 0.30
«
Reply #19 on:
March 24, 2020, 10:29:18 AM »
Thank you for a fascinating post.
Very detailed and informative, providing many many ideas for future projects.
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SPA M11 (M22) conversion to 0.30