Benjamin Benjamin MROD quit firing

[mikesxpress]

Benjamin Marauder.22 Gen 2. Purchased new 4/5/16. Added Archer Airguns Tune Kit for Benjamin Marauder Air Rifles in 2022. No other modifications. Pest control PCP that has been cleaned & maintained.

The gun has shot fine for years until this afternoon. Fully charged to 3000 PSI per the gun gage and liquid filled gage on my Air Venturi 98 cf tank. Low pitch pfffft after trigger pull. Knew that wasn't right. Got the pellet out of the barrel, cleaned everything, lubed the barrel/bolt O ring. Next shot same thing. Pellet only went a half inch in the barrel. I've never taken this gun apart any further than removing the barrel shroud and cleaning the barrel, baffles, and shroud tube. Only pure silicon lube on the O rings.

I have a rebuild kit with all the O rings but don't want to do all that if you guys have a simple solution to correct this. Thank you in advance. Mike

 

[Motorhead]

Hammer may be gummed up ?
Valve poppet might have broke having the stem breaking off the back side & sliding up on said stem ... No stem protrusion at valve face = minimal if any air release. ( Generally this type failure will slowing leak all the air out. ?

ONLY WAY to correct and figure it out is going threw it to find the issue. Experience in understanding the operational parts & pieces is somewhat key here ..... get some help to teach you what your looking at and looking for ... Or send it out for servicing.

JMO

 

[joelayfield]

is it a nylon hammer ? those can get real sticky when silicone gets on the hammer , aluminum get a little sticky as well , the cast original hammer is less likely to get that sticky as to not move the pellett out the barrel , that would be more of an erratic shot string , or its what motorhead said or an obstruction of some sort in the hammer area

 

[mikesxpress]

I haven't had the gun apart any further than the cleaning noted in my post.

 

[Frank in Fairfield]

Send it to Scott.
Just the action.
Not the stock.

 

[mikesxpress]

Scott who and why?

 

[Motorhead]

Your on the east coast ... NOT practical to send to Left coast for a service / discovery issue you can likely resolve yourself.

As to a NYLON HAMMER ... only done in the after market on modified to be regulated guns. If your gun is factory stock ? it has a steel hammer in it.

 

[mikesxpress]

Stock gun. Not regulated.
What does the nylon hammer do for the gun?

 

[JohnL57]

Here's a good video on disassembly and some info on tuning. Marauders are simple guns and easy to work on if you have basic mechanical skills.
The nylon hammer is an aftermarket item to help increase shot count. There are a lot of mods available, but do your research before you dive in.

 

[mikesxpress]

After a conversation with Crossman customer service in regards to a local authorized service center the representative said as of recent they will no longer sell any internal PCP gun parts to the public due to liability reasons.

 

[mikesxpress]

Sent the the MROD to Rich at AR.
$98 full rebuild and test. Back to me in a week. The $34 UPS shipping is the killer. I'm running thousands of pellets thru this gun and he says about every 5-6 years it needs resealed.

I have a 1970 AMX to tinker with. I'm not messing with an Airgun.

 

[PCPBarry]

Sending to Rich at AR sounds like a good way to go. It would still be interesting for many of us to learn what actually failed. Maybe you or Rich will be able to post that info.

 

[mikesxpress]

Sending to Rich at AR sounds like a good way to go. It would still be interesting for many of us to learn what actually failed. Maybe you or Rich will be able to post that info.

The overmold plastic separated from the steel exhaust pin.

 

[Motorhead]

The overmold plastic separated from the steel exhaust pin.

Common failure, next to entire head fracturing, or a big chunk at seat cracking off

 

[mikesxpress]

I've had the MROD since 2016 and run about 2.5 tins (500 count) of JSBs each year thru it. 1st issue with the gun in 9 years of continuous use. No complaints.

 

[Airgun-Revisions]

I've had the MROD since 2016 and run about 2.5 tins (500 count) of JSBs each year thru it. 1st issue with the gun in 9 years of continuous use. No complaints.

Absolutely, It’s mostly common with guns of age as they’re usually the longest running factory PCP’s out there. Or someone has done something to the gun they shouldn’t have. Based on the % that runs through here or Benjamin. Right now I’m seeing an uptick in 2017-19 models which is par for the course and should be serviced anyway if they haven’t been. Just age, overmold deterioration and usage.