New benjamin XL 1100 wnp trail help!!!

[Gary J albouthabenjamins]

I own two 22 caliber BENJAMIN'S XL in 22 1100wnp I have one that is amazing shooting 29 fpe however I had some trouble with the other one and had to return do to piston seal and got a new one yesterday I ran 5 shots over the crony with a 16.36 pellet it traveld average 780 with a little under 23 fpe what can I do does anyone still work on these ? Any info would help  !!!

[unionrdr]

Did you check the breech seal? That velocity is low for a .22 magnum. It only has two seals in it. Piston and breech, that's it. Rebuilt one once for a friend.

[A.K.A. Tommy Boy]

Hi Gary.

My name is Tom.

I have read ALL of your posts so far on your Benjamin NP XL rifles.

I used to own a 2010-2011 Gen. 1  Benjamin NP XL 1100 myself. 

I used my rifle primarily for hunting.
> https://www.gatewaytoairguns.org/GTA/index.php?topic=142805.msg1445649#msg1445649
> https://www.gatewaytoairguns.org/GTA/index.php?topic=135263.msg1349909#msg1349909


I don't think that anyone works on these anymore except maybe John ( the tuner ) at Pyramid Air.

The velocity of your gun is not right.

It could be the - Breach seal - Piston Seal or the gas charge in the NP XL Nitro Piston.

AS for me...I would replace all three.

I would hone & de-burr the cylinder area first then put in a thin coat of moly before I installed the new Nitro Piston and new seal.
Also I would thinly coat the piston seal with moly.
These rifles can smoke a piston seal real fast if the cylinder area is not properly lubricated.


I hope I have been of some help to you sir.


Best Wishes - Tom

[Gary J albouthabenjamins]

Did you check the breech seal? That velocity is low for a .22 magnum. It only has two seals in it. Piston and breech, that's it. Rebuilt one once for a friend.

is there anyway you would be interested in building another for some cash to get the right fpe and fps I'd be very thankful I just don't really want to take the rifel apart myself

[Gary J albouthabenjamins]

Thank you very much for the info tom I really appreciate it I'll try prymid Monday I've watched u tube videos on how to put in New piston and seal including breech but idon't want to get into the rifel when I've never done it before I'll pay someone to fix it if I can find someone or take my chances and bring it back AGAIN!! I'm lost and just need someone with experience on these nitro pistion super maganum break barrels

[unionrdr]

Changing the breech seal is easy. you just need a seal pic to get the old one out. It goes around the hole where you put the pellet to shoot. I got this set of seal pics from Harbor Freight for a couple bucks to do the job.

  Besides, it'll cost more than the parts to ship it all the way to me in Ohio & back. And I'm not a tuner, just the village tinker with a good amount of experience in many things mechanical.