The Xisico Sentry Fan Club :)

[M_thompson42nd]

Pic 2

[Dead Springer]

the probe on my 705 does the same thing.  When you find the solution please post it, I'd like to follow suit.

[Nvreloader]

Matt
I am quite familiar with that problem, one way to cure that problem is when you are installing the trigger back,
is to install the front screw about 3/4 of the way tight, then have the rear screw a slip fit for sliding.

Then gently push the trigger to the rear, with the bolt open,
you will see the bolt/probe move toward the rear (deeper into the action),
I move/go back .050" to .100" deeper than the front face, and tighten down the rear screw,
then the front screw and check the movement and installing/removing ALL mags etc.

If everything is OK, I leave it alone, if not I adjust till I get the clearance needed etc.
Note: if you do go to far back with the trigger housing, the sear will hang up and cause problems for releasing etc,
and you are working against the hammer spring tension etc.

You can also do this, if in stock OEM form, and everything works OK, remove the action from the stock,
and measure from the rear of the trigger guard base to the end of the pressure tube,
note this measurement and return to this same measurement, when finished etc.

HTH's
Don

Upon inspection, I can see that the pellet probe is the culprit, not the bbl. spacing. It is a good millimeter or two out of the receiver block when in the cocked position

[M_thompson42nd]

Thanks don!
I had a thought.... maybe it's good that it is protruding just a tad. It might help seat the pellets deeper into the cavernous chamber. I can get my mags in still. And it doesn't seem to interfere with the mag rotation. I just have to pull the lever all the way to the rear while inserting the mag.
What do you think?

[Wayne52]

Matt my 705-2 was like that when I first got it, took it apart to do some modifying, reassembled after cleaning and lubing good reassemble with the trigger group position correct and it cocks much easier this way.  It's a bolt action and not lever.

[Nvreloader]

Matt
That won't help with the chambering depth of the pellet, the bolt can only go so far forward when closing etc,
the skirt depth of the pellet will be the deciding factor, as I only have a half a dozen of the OLD Beeman pellets,
I do not know the skirt depth of the modern ones, as my pellet order hasn't got here yet.
I use a good straight edge to check and see if I got enough clearance.

I have been doing some careful measuring regarding the probe depth etc, (side lever probe),
and about the only way I can see to have a foolproof method is to drill and insert a needle probe,
into the front of the probe nose etc.

I will have to move the trigger base back some more. I do NOT like the chamber in my 25 cal,
I have, it can be made better, I think.
In my case, then the bbl is pointed the pellet could slide all the way to the rear, coming to rest against the probe nose,
and just the opposite when the bbl is pointed down etc, NOT GOOD............ the chamber diameter is way TOO BIG and LOOSE.

I have a pill bottle full of various needle bearings kinds/sizes from when I worked in Lorin's shop,
the needle bearing cages would break and the needle bearings fell on the floor,
They make perfect probe extenders, hardened, polished semi round ends etc etc.

Don

[Nvreloader]

Wayne
Question for you,
On your 25 cal, when you chamber a pellet, if you turn the bbl straight up, does the pellet fall out of the chamber? With a slight bump?  On my bbl, the pellet will fall out under it's own weight,
The chamber diameter of my 25 cal is .264" x .420" deep, before hitting the lands and grooves.............
This is for the OEM wasps waist type of pellets.
Thanks,
Don

[Wayne52]

No it doesn't but I've only used my cast pellets, the 26 grain Hunters and 34.5 grain Magnum hunters.

[Wayne52]

I shoot nothing but slugs from it now at up to 50fpe

[Zeddymon]

Wayne
Question for you,
On your 25 cal, when you chamber a pellet, if you turn the bbl straight up, does the pellet fall out of the chamber? With a slight bump?  On my bbl, the pellet will fall out under it's own weight,
The chamber diameter of my 25 cal is .264" x .420" deep, before hitting the lands and grooves.............
This is for the OEM wasps waist type of pellets.
Thanks,
Don

it may be that waynes being a pre-production run had a little more care in the chambering, and then when they got to the factory runs,,,well you know what happens when you try to pump out a bunch without checking every 20 or so,,,specifically a .25 issue i understand

[scion19801]

so is this gun worth a purchase? i see a lot of good things and then a few issues crop up here and there. I know there is one for sale 705-9t model in .25 cal side lever. apparently the first one the guy had , had been returned due to a bad barrel. he got the replacement and put two mags through it. now selling it. really tempted to get it. i know wayne had done some amazing things with his. would want one capable of slugs, as my gauntlet is so so with them presently. this is after extensive work. finally did get poi/poa rock steady and no shifting.
if i get the sentry it would be my first tube gun, and unregulated. would be awesome to bottle and regulate one with a decent size plenum. seems like it would be pretty easy to do.

[Nvreloader]

Zed/Wayne

It may be these OLD Beeman pellets from the 70's, 

I won't know for sure until I get my pellet order in, it may be that the skirts are undersized?
I am not going to drive 110 miles one way, to find some 25 cal pellets, at the rip off stores in RENO etc.

These pellets measure approx .254" at the widest part of the skirt..........as close as I can measure them...

Thanks,
Don

[Zeddymon]

jsb exact king heavy 33.95gr is .258"
benjamin  domed  .252"
.249" on nielson 250-hs-hp-db-26.8-325
and some xisico pellets i have are oblong and go from .254"-.261" as you turn, seriously

i have best results with my hawk with the jsb king heavy

[Wayne52]

I just checked and both 26 grain and 34.5 grainers that I cast are about .258 give or take a thou but those pellets shoot great from my .25 cal as long as it's tuned for them.  I can turn mine all the way up for the 34.5 grain which are sure good pellets for it with ultra smack. I prefer the slugs though they're awesome slugs in hollow point and extremely accurate.

[M_thompson42nd]

Happy 4th to everyone!
Have fun and be safe!

M@

[M_thompson42nd]

Matt
That won't help with the chambering depth of the pellet, the bolt can only go so far forward when closing etc,
the skirt depth of the pellet will be the deciding factor, as I only have a half a dozen of the OLD Beeman pellets,
I do not know the skirt depth of the modern ones, as my pellet order hasn't got here yet.
I use a good straight edge to check and see if I got enough clearance.

I have been doing some careful measuring regarding the probe depth etc, (side lever probe),
and about the only way I can see to have a foolproof method is to drill and insert a needle probe,
into the front of the probe nose etc.

I will have to move the trigger base back some more. I do NOT like the chamber in my 25 cal,
I have, it can be made better, I think.
In my case, then the bbl is pointed the pellet could slide all the way to the rear, coming to rest against the probe nose,
and just the opposite when the bbl is pointed down etc, NOT GOOD............ the chamber diameter is way TOO BIG and LOOSE.

I have a pill bottle full of various needle bearings kinds/sizes from when I worked in Lorin's shop,
the needle bearing cages would break and the needle bearings fell on the floor,
They make perfect probe extenders, hardened, polished semi round ends etc etc.

Don

Don,
I was on the interwebs and saw that someone had designed an adjustable length pellet probe that is threaded in the center all the way through bolt. The probe pin is moveable back and forth that way.
I believe it was for an FX impact though.
 You might be able to get some ideas if you can find an example of it.

[Wayne52]

I see that once again Mike@Flying Dragon Airguns has gotten more .22's and .25's in stock again !!!  Believe me these guns are very easily modified and have impressed me ever since I've been opening the ports, removing burr's (especially from both hammer and valve springs), cleaning lubing everything with quality lube after a thorough cleaning.  I honestly don't expect them to last long though due to the fact that recently people have been scarfing these guns up VERY fast. 

Hint to XISICO from me if they're going to continue improving on this already excellent gun I recommend a titanium air tube and adding a regulator.  I have no doubt that Xisico has toyed around with these idea's already and probably has a secret prototype in their midst

[Nvreloader]

Wayne

I have been talking to Wes Bob (in Canada) about reg's for this rifle series etc, per him,

If you have a Sentry 705 model with the burst disc block in the pressure tube,
you won't be able to use a reg, NOT enough room between the valve face and burst disc block,
and the reg has to seal against the valve cap face etc, which would mean remaking a new valve cap,
so the reg can seal around the valve cap etc.

Tia,
Don

[Wayne52]

Don I don't really plan on regulating either my 705-9K or the 703-5K because actually both are good enough for my hunting purposes.  These guns get a decent string the way they are I think.  Xisico I'm sure could do another upgrade however they'd have to do some changing with the airtube that's on the new guns.

[sandman20]

I bought a 702 in .25 cal from Mike about 3 weeks ago and so far, I love it. What are the advantages of the 705? I know it has a side lever which seems all the rage these days. I'd love to get a PCP in .22 cal also. To me, these seem so much better made than some of the other budget offerings.