Evanix Tactical Sniper

[Rdsail]

You are sure stock on the crosmans. My point was to follow your own advise. Don't put other guns down just because they don't fit you "personal view".

[Nomadic Pirate]

You are sure stock on the crosmans. My point was to follow your own advise. Don't put other guns down just because they don't fit you "personal view".

Man, that's funny how maurader owners try bring up stuff on threads that have nothing to do with it, LOL

I would discuss that on an Other thread since it don't belong here, I sure never brought up or mentioned any comparisons with Maurader/Crosman on this thread

[Rdsail]

I though we were talking about FX(other high end guns) having a lot more problems than more more evanix. lol. I most of mis understood.

I just thought that your statement was to far reaching as far as problems with guns. I do have to say that it is great that Evanix has PA behind them and not AoA.

I can see that this will not go anywhere, so I will not highjack the thread. Sorry guys.

[rkr]

Bolt seals nicely in the barrel o-ring.

I'll take a look at the valve stem, hope that's not the case - I will be most displeased 

Did you find anything? I had a completely new valve made without the o-ring groove. It doesn't use more air and now I know that it won't break at an inconvenient moment.

[dogwood]

nope didn't find anything, stem still looks fine.
Ran another 25 rounds through it yesterday without a hitch - still not sure what happened on that one.

was still finding shavings (though smaller) when cleaning the barrel so I smoothed the port area some more and polished the leade as well

while looking in the barrel I notice something that looks like pitting  there is a "ring" about 2" in from the breach

I'm hoping to get a chance to fire it over the Chrony today and do a bit of tuning, then 50 yard accuracy tests

it's using a lot of air right now, 5 shots take it from 200 bar down to 130ish

[Nomadic Pirate]

Way to much air, should get +/- 7 shots from 200 BAR to 150 BAR

[dogwood]

OK played with it a bit today, with a weaker spring on the valve and 3 coils cut from the main spring adjuster turned in till flush with back of receiver I got the following string using JSBs
883.5 fps  200 bar
885 <- 135 fpe
879.3
871.6
859.8
839.1
826.0 150 bar

Much better than stock as far as consistency goes.
backed off 2 turns from flush
834  200 bar
849.1
859.4
870.2  <- 130.5 FPE
867.8
868.9
866      160 bar
856.8
843
822


backed off 1 turn from flush
862.4    200 bar
870.7
879.1   <- 133 FPE
878.6
874.9
867.5 155 bar
had mag issue only got 6 shots

1/2 backed off from flush
860.7 200 bar
874.7
881.2
882.7  <- 134 FPE
no feed     -> another mag issue (operator error)
868.5
857.9   150 bar

same settings (1/2 off) with .358 95grn HPs  (fixed mag issue)
808.2  200 bar
823.0  <- 142.9 FPE
813.2
812.2
820.2
821.1
810.7

Opened up the valve inlet just a little

And cleaned up the outlet a lot, smoothing and shaping - also smoothed the transfer port and leade in

now to see if the improved consistency translates to improved accuracy

[Nomadic Pirate]

not an expert in reading numbers, but it looks pretty darn good to me now

[dogwood]

worlds better than before, went from a 127 fpe to 142 fpe gun way more consistency and actually tunable.

juries still out on accuracy... last shot of my sight in I had a baffle clip - first time thats happened in several hundred rounds.

printed up a couple of replacements but tried to get fancy, think it hurt more that it helped - printing some more simpler ones now.

[wwonka]

worlds better than before, went from a 127 fpe to 142 fpe gun way more consistency and actually tunable.

Dogwood, this has been an interesting thread so far.

Do you mind briefly summarising what changes/fixes you've made to the sniper so far...?

[dogwood]

NP,  Deburred the hammer, polished all the moving parts, replaced the broken valve, added a few more holes to the valve intake area, used a diamond ball burr to smooth and round the valve port area, did the same for the barrel port area as well.

I had to trim the length of the hammer guide bolt as it was catching the spring. I replace the valve spring with a slightly shorter and weaker one, I trimmed of 3 coils from the main spring and made ACETAL washers for it.

I've also fire lapped the barrel.

Almost forgot, I also had to deburr where the pressure tube retaining screws come thru on the receiver, they where shaving the o-rings on the valve

[rkr]

NP,  Deburred the hammer, polished all the moving parts, replaced the broken valve, added a few more holes to the valve intake area, used a diamond ball burr to smooth and round the valve port area, did the same for the barrel port area as well.

I had to trim the length of the hammer guide bolt as it was catching the spring. I replace the valve spring with a slightly shorter and weaker one, I trimmed of 3 coils from the main spring and made ACETAL washers for it.

I've also fire lapped the barrel.

If you want a bit more a 6.5mm transfer port (+ barrel and valve housing openings) will get you to 150 fpe. What we need next is a source for stiffer hammer springs, the stock one is horribly soft and long and contributes masses to the hammer bounce.

[dogwood]

I might start looking for more power once I get the accuracy where I need it, right now it's not there

Consistant valve opening should help, have to see how the new baffles do and then think of what needs done next.

[rkr]

I might start looking for more power once I get the accuracy where I need it, right now it's not there

Consistant valve opening should help, have to see how the new baffles do and then think of what needs done next.

Baffles? Do you mean for the shroud? There's just too little volume in there for it to make any real difference.

[Nomadic Pirate]

I have a AR6 shroud on my .357 that is 3 1/2" longer thn the regular shroud, I have 5 baffles in there and it does make a difference,
I than Have a 6" Neil Clauge LDC, 2" actually overlap the Shroud so it's only 4" longer than the end of the barrel.
 overall noise difference is significant

[dogwood]

I added a bit to my shroud

[rkr]

OK, that WILL make a difference. Is that 38mm pipe or larger? I'll have one made of 50mm pipe.

[dogwood]

Yes, it's a  1.5" tube (38.1mm)
50mm would be pretty nice

And it does make a huge difference back yard friendly with it on

[Nomadic Pirate]

Holy cow ! ..you're not afraid of drilling new guns, LOL

[wwonka]

Holy cow ! ..you're not afraid of drilling new guns, LOL

Seeing the sorts of results you guys are getting from a bit of hands-on machining, I think I'm about to pick up a second hobby. Guys like tofazou (and other guys here on this forum) seem to get quite a bang for the buck modding these guns with a little straightforward hands-on machining.

It would be great if someone put together a "basics-you-need" list of machine tools/essentials for an airgunner.