Spa M10 100fpe .22

[Guest]

I started this project since few ppl on our finnish forums were building and having some awesome results with 5.7mm gunbarrels fitted to different type of airguns. Generally its pretty decent caliber since you can buy some ready 22LR bullets from RWS and you can also have some pretty high BC numbers out from certain long bullets while driving them on decent speeds with under 200bars.

I found SPA M10 on sale with pretty decent pricetag of 295€ from Krale and decided to fit 222remington barrel from LW on it. Stock the gun was pushing 28.4gr eu jin pellet at 730fps.

First I started by opening everything except barrel to 6.5mm and removing closing spring from valve to reduce force needed to open it fully. After that I fitted barrel on it and added some extra 3.3mm lockingpin to make sure barrel stay on its place with alot higher forces than stock gun is designed to take. There is also fairly big risk with the bolt of this gun shooting on ur face if the one and only screw that holds it lets go when fireing so some extra locking mechanism was added. I did also cut barrelband away and added some silicone type material between air resevoir and barrel to make it semi freefloating barrel to try to improve harmonics.

This still is on work in progress stage mainly just testing and trying to find right preassure, speed and bullet combination but when maxed out it pushes 41.4gr RWS 22lr bullet at little over 1000fps and Noe 51gr spitzer at 920fps maxing out at 130j. With a slight hammerspring adjusting to reduce power you can get 5 really steady shots out from it at 95% of the full power but it was purely built to shoot as externally regulated gun. 

Noe 51gr spitzers

 100meter group. But still far from meeting sub moa constantly. 

 

[steve123]

Just some wind got to this group, right??, otherwise it looks like it's 1/2" or so vertical.

Very promising and BC for those 51's must be .19-ish G1??

 

[Guest]

Well it surely dont shoot groups like that all the time and barrel probably need some firelapping since its leading up but iv only tested it once out to 100meters so far.

Not sure about exact BC number of that bullet but if I remember right its 0.2-0.205 G1

 

[Guest]

Wasnt happy with the paintjob so I decided to sand stock and add some truoil finish on it. While I dont really shoot alot during winters its really good time to see what you can do to improve. I calculated that my valve was the choke point in flow since it was same size as rest but pin axel taking its area so I decided to drill it bigger and make new sealing poppet but this caused another problem. Valve lock. So damn had to get new stiffer and stronger hammerspring to get it open. Well end results was kinda not as much as I expected. 51gr spitzer 950fps and 41gr rws 22lr bullet 1024fps but this was meassured in - 4c so I assume those numbers go up more when its more steady +20c at summer. I found out pretty interesting results when my valve was locked and not opening well on high pressures. With those massive air channels gun was shooting those 22lr bullets 850fps+ with under 110bars. 

 

[Glem.Chally]

Pretty damn impressive!

 

[Guest]

Pretty damn impressive!

Thanks !

 

[mercado]

Wood work Look great. N is shooting awesome. found the ..223 1-12 30" tj liner has them available .. now they are in the machinists..let se how it works.

 

[Guest]

You surely went right way with 223 1:12 barrel. Are you going to sleeve it? My barrel is 0.78" dropping down to 0.59 but now if I would redo everything I would leave it as thick as possible. My barrel is only 24.8" so you should get some sick velocities out from 30".

 

[davidsng]

This is amazing power! What type of thing did you have to do internally to get that?

 

[Guest]

This is amazing power! What type of thing did you have to do internally to get that?

It is just really simple job of opening air channels to bigger than caliber is and elongated barrel port and also removing closing spring and its socket from valve. But most importantly before you upgrade power of this gun make sure you secure bolt since its only hold by one screw and if it snaps it shoots out dirrectly to shooters face and since this gun was only designed to take like 35fpe It will almost surely let go at 100fpe. My solution was to mill L-shaped locking rail onto bolt and drilling tap to upper frame so the old screw and new screw lock at same time. Also key feature is to make sure all ports match in size and shape even small edges and bad surface cause massive energy loss on fast flowing air. 

 

[mercado]

Barrel is 9/16 thick , i need a carbon sleeve will try to buy a sleeve 1/8 thick to make it almost 1" thick barrel ... will post the pics as soon is finish...the valve I have push 88g .25 cal at 1050 fps .. my heavies bullet molds weight 61g bt .. will check my hammer weight to maintain speed under 1000 fps.

 

[paran]

Hello from Kefalonia Island, West Greece,

I just finish a conversion of one SPA M22, from .25 to .30, with a Spanish barrel.

I used balanced valve, a little heavier hammer, SSG to control the power and the bounce and I modified the rear bolt to move back after pushing the pellet in the proper position in the chamber, leaving the barrel port completely free...

The gun remains regulated at 150 bar and from 250 bar gives 18 regulated shots at 900 fps (+/- 5) and another four useful shots with less speed...

I opened the air channels, with elongated barrel port and i set up the SSG to be at 900 fps with the heavy JSB .30, means almost 90 fpe...

I am working now on a very light thumbhole carbon fiber stock for the gun...

Its almost impossible to find here slugs for it, but i am working to construct a swagging kit for 60-70 grains boat tails...

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[Guest]

Good job man. Looks nice. Alltho I highly recomend you to do something for that bolt. It can be leathal if that screw snaps and you end up with broken skull atleast. You have to see that the same force applys to ur bolt as it dose to your projectile and no one should be comfortable holding head dirrectly behind that massive metal bar when its only one small aluminium edge holding it with small screw.

Your gun seems to be M11 atleast the upper is thats repeater version of M10 and seems to be 25MPA fill :O

 

[paran]

good morning jiikuu,

To make the bolt absolutely safe i choose an easier way than the "L" shape milled groove you did.

I change the original M5 allen with a modified one i made in my lathe from a good quality steel (Uddeholm Corrax)

After heat treated this (inox) steel became 45-50 HRC hardness...



Yes, the gun was similar to M11, regulated, with full shrouded barrel, 250 bar air tank and as 0.25 cal. has an 9 shot loader.

Forgot to mention that i modified also the loader, to a six shot finger rotating 0.30 which works perfect to my .30 conversion...





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[Guest]

Good to see you took actions to secure that bolt nice looking job! 

 

[mackeral5]

Very innovative builds here, thank you for sharing.

 

[Guest]

New oversize bolthandle design. Cant wait till summer starts and I can actually shoot this thing. 

 

[mtnGhost]

Incredible!! I love how it's coming along

 

[Ranchibi]

Beautiful craftsmanship! That is one beast you created! Can’t wait to see updates.

 

[Guest]

Thanks will deliver it to one youtube content creator as soon as I get it to perform at level Im happy with