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PostPosted: Mon Jul 10, 2017 11:46 am 
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Joined: Tue May 30, 2017 12:41 pm
Posts: 8
Looking to swap my Benjamin Classic from spring to nitro piston, anyone know where I could find info on how to do that? I'm about to order my conversion kit.

Thanks.


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PostPosted: Tue Jul 11, 2017 12:00 am 
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Joined: Sat Jan 25, 2014 9:16 pm
Posts: 1278
Location: United States
This should cover it


Attachments:
Nitro conversion.JPG
Nitro conversion.JPG [ 149.53 KiB | Viewed 791 times ]
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PostPosted: Tue Jul 11, 2017 9:16 am 
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Joined: Tue May 30, 2017 12:41 pm
Posts: 8
Oh cool, yes this does help, I guess I would still need a spring compresser?


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PostPosted: Tue Jul 11, 2017 10:50 am 
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Joined: Mon Aug 08, 2016 7:23 am
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Location: Somewheres near the Atlantic
topic73899.html

They should sticky this.


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PostPosted: Thu Jul 13, 2017 2:48 pm 
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Joined: Wed Jul 01, 2009 3:23 pm
Posts: 3070
Location: Northern Ontario
CowboyDan wrote:
Oh cool, yes this does help, I guess I would still need a spring compresser?


Yes.

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PostPosted: Wed Jul 19, 2017 7:44 pm 
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The pasted pic is a bit too complex, the only available "kit" in Canada is pretty much plug/play, but may have to expand your stock mounting screws a bit.

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PostPosted: Sat Jul 22, 2017 10:47 pm 
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Joined: Wed Nov 16, 2005 9:58 pm
Posts: 113
Location: Mosсow Russia
Hello!
Importantly, must lock the trigger box.
You cannot remove pyramid from the spring rod. This leads to damage trigger box

http://gnom256.narod.ru/obzori/crosman_gp.html

Sorry for non translation :)


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PostPosted: Mon Jul 24, 2017 8:43 am 
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Joined: Thu May 07, 2015 8:30 pm
Posts: 1190
Location: Eastern Townships
Here is the translation of GnoM's post on Guns.Ru forum, with his permission and collaboration :) :


Installing a gas spring into Crosman rifles without an NP index

The question of installing gas springs on Crosman, Stoeger and other Chinese Gamo clones is actual for more than 10 years.

It would seem that everything is simple, this guns is a Chinese counterfeit Gamo hunter 440 of the old model, it would be logical to assume that the installation of NP is performed in a similar way.

Yes indeed. You can take and install a gas spring in Crosman, same way in Gamo. The rifle will be cocked and fired ... for a while.
But one day, usually it happens somewhere through box of pellets, the rifle simply ceases to cock.

One important part, the stepped spring seat.
In Gamo rifles, its main purpose is to hold the original spring. The stepped spring seat is thrown away when installing gas spring on the Gamo rifles until 2010.

In clones, the spring seat performs a very important function, it supports the trigger block.

https://fotki.yandex.ru/next/users/gnom ... iew/656870

Without the spring seat, trigger box is deformed and presses closer to the compressor tube. As a result, the sear will not be able to be cocked.

It looks like this : https://fotki.yandex.ru/next/users/gnom ... iew/656871

And sometimes, bracket of trigger is broken off.

https://fotki.yandex.ru/next/users/gnom ... iew/656872

In order to avoid this, you need to buy or make a new spring seat, which will support the trigger box.

https://fotki.yandex.ru/next/users/gnom ... iew/656899

https://fotki.yandex.ru/next/users/gnom ... iew/656898

Now you can proceed directly to work.

Unscrew the three screws and remove the stock.
Do not lose the bracket. If the bracket came out with all the iron, it is better to install it back into stock.

https://fotki.yandex.ru/next/users/gnom ... iew/656873

https://fotki.yandex.ru/next/users/gnom ... iew/656874

https://fotki.yandex.ru/next/users/gnom ... iew/656897

Unscrew the trigger bolt. Use 10mm wrench.

https://fotki.yandex.ru/next/users/gnom ... iew/656876

https://fotki.yandex.ru/next/users/gnom ... iew/656877

Extract pin. Smoothly release the spring.

https://fotki.yandex.ru/next/users/gnom ... iew/656881

https://fotki.yandex.ru/next/users/gnom ... iew/656882

https://fotki.yandex.ru/next/users/gnom ... iew/656884

https://fotki.yandex.ru/next/users/gnom ... iew/656885

After that, break the barrel, and remove trigger box from window.
Extract the piston. Do not lose the plastic U-shaped insert!

Remove excess lubricant.Make sure that the grease does not get into the zone in front of the seal, otherwise the dieseling will not be avoided.

Insert the piston and level rod.
Now you need to install the trigger box.

Important!
Pay attention, the sear should lie on the shelf. If it falls, rifle will not be able to be cocked. Plus, hardened sear inevitably do damages to the gas spring.

https://fotki.yandex.ru/next/users/gnom ... iew/656886

https://fotki.yandex.ru/next/users/gnom ... iew/656887

The spring guide must be removed from the spring seat.
It is better to pull it all out and throw it away.
However, in this case, it is allowed to simply cut guide.

https://fotki.yandex.ru/next/users/gnom ... iew/656889

https://fotki.yandex.ru/next/users/gnom ... iew/656891

Take the centering part and attach it to the rod with grease.
All these parts are carefully put in the rifle.
Make sure that the part does not come off the rod and rests to bottom of the piston.

The spring seat will rests against the trigger box. When assembled, the plastic rear cap will hold it in this position.

https://fotki.yandex.ru/next/users/gnom ... iew/656893

https://fotki.yandex.ru/next/users/gnom ... iew/656894

https://fotki.yandex.ru/next/users/gnom ... iew/656895

https://fotki.yandex.ru/next/users/gnom ... iew/656896

The trigger box is held in place according to original factory calculations.
It is on this principle that were made Crosmans with NP, the rear plastic cap in these models centers the one-piece spring seat in position.


I strongly recommend installed gas springs in Crosman and Stoeger only in this way.


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PostPosted: Mon Jul 24, 2017 11:44 pm 
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Joined: Sat Jan 25, 2014 9:16 pm
Posts: 1278
Location: United States
It will work per my pix, obviously since I did it, but I spoze over time it could snap the tail end off the trigger like in the pix. Reason being (imo) the trigger will be allowed to vibrate a bit from the harsh piston impact. I can't imagine it breaking but who knows. If it were to bother me I'd simply bend the trigger ears that slide into the receiver so it's a tight fit. Optionally people could buy BT9M22-00-2 (~$4CA) which is the oem nitro end, but its pin hole is in a different spot (.100" fwd compared to the coil gun) so you need to either drill/tap a new hole in that part for the trigger bolt in the correct spot, or mod to receiver and stock to accept the triggers new position. If you do the latter method it will net a little more power since it increases stroke by that same .100".
Or forget the gas and stick to the oem coil spring (or buy a better quality one) and call it good.


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