Difficulty cocking/reloading - stuck bolt ?

Benjamin Marauder Troubleshooting
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Difficulty cocking/reloading - stuck bolt ?

Postby drplinker » Wed Jan 21, 2015 8:31 pm

I bought a Gen 2 0.22 marauder, was very satisfied with accuracy noise etc. About 2 months later, bolt started sticking and cycling got harder. Each reload was different, sometimes easy (as in normal), sometimes bolt got stuck, literally and sometimes rough, as if something was tearing metal.

I polished hammer, applied silicone grease, moly grease, dupont dry teflon etc - wasted a plenty of time and money. With silicone & moly, I think pellet velocity varied as POI would drop often, randomly and teflon wore of in weeks.

Later found this video on youtube, thanks to Robert, describing exactly same problem and Rob suggested 'Archoil AR8300' grease. Look at comments on Youtube. Very expensive, but a much better and possibly most slippery grease available. I contacted manufacturer to check whether it is safe on O-Ring and it is.

If any of you are facing same problem, try it out or tell us in what other way you resolved it. Thanks in advance, Dave

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Re: Difficulty cocking/reloading - stuck bolt ?

Postby Family Man 811 » Wed Jan 21, 2015 11:58 pm

I had it on my gen 1 .25 cal. Ended up buying a new air tube from Crosman ... Like 40 bucks .. I was paranoid so ordered the breech and bolt too..it was the tube I think some how the area that the hammer pin travels was imperfect. Anyway started with air tube and it was solved. Hasn't happened since.
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Re: Difficulty cocking/reloading - stuck bolt ?

Postby PB_Matrix » Thu Jan 22, 2015 8:03 am

Almost exactly at the 5,000 pellet mark on Saturday my .22 Mrod bolt started binding exactly as stated in the OP. Noticed the wear marks in the bottom of the air tube as shown in the video, polished them smooth with a Dremel and polished the back and bottom of the hammer as well. Re-lubed as normal and the bolt began binding again at about 50 shots. Dang it. Broke the gun down again, re-polished the fresh drag marks in the air tube, then beveled and polished the rear bottom of the hammer to counteract the binding shown in the video. Test fired another 50 shots and did not notice any progressive bolt binding like before. Anyway, beveling the back of the hammer, near the bottom seems to be working for me so far. If it starts binding again, I'll give Crossman a call to get a new hammer and air-tube.
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Difficulty cocking/reloading - stuck bolt ?

Postby JDUB » Sat Jan 24, 2015 7:58 pm

I had this happen on my original gen 2 .25 and I ended up sending it back to crosman and with the new one I lubed with high slip synthetic grease. Now I clean and lube the bolt and tube more frequently to avoid it happening again. No probs since. The new one came with different, updated I think, bolt and hammer cocking lugs.


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Re: Difficulty cocking/reloading - stuck bolt ?

Postby buschmaster » Thu Oct 26, 2017 12:41 pm

think i got the same problem verry verry verry frustrating ive been assembing/de assembling the gun for about 10 times last days and no luck...GGGGRRRRRRRRR :cry:
.25 genI Rifle WAR HIGH ENERGY VALVE-NO BOUNCE HAMMER-3D DEPINGER-TRANSFERPORT TUBE-12.5 AND 17 LB SPRING AND DRILLED OPEN BARREL PORT
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Re: Difficulty cocking/reloading - stuck bolt ?

Postby buschmaster » Thu Oct 26, 2017 12:46 pm

also when the hammer is cocked and i fire the hamer got stuck when hitting the valve stem causing to blow all air out i 1 shot.. but when the breech is not assembled all seems to work fine and the bolt moves also free i the breech !?
.25 genI Rifle WAR HIGH ENERGY VALVE-NO BOUNCE HAMMER-3D DEPINGER-TRANSFERPORT TUBE-12.5 AND 17 LB SPRING AND DRILLED OPEN BARREL PORT
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Re: Difficulty cocking/reloading - stuck bolt ?

Postby lennyk » Thu Oct 26, 2017 10:03 pm

do you have a drill press?
A quick fix is to drill some indentations in the hammer and put a piece of delrin in those holes and trim them to be just a hair above so the hammer will glide on delrin instead.
You need to use a carbide cutter intended for Dremel.
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Re: Difficulty cocking/reloading - stuck bolt ?

Postby 22synrodn » Fri Oct 27, 2017 4:38 pm

Yet another option F.A.M.E. Mod. It works!
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22 Synrod Unregulated. Tuned using JSB 18.13gr:
30 Shots @ 31.02 FPE Avg., ES 1.36% (12 FPS), 1.58 FPE/CI


25 Synrod Regulated. Tuned using JSB MKIIs 33.95gr:
24 Shots @ 55.92 FPE Avg., ES 2.08% (18 FPS), 1.45 FPE/CI
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Re: Difficulty cocking/reloading - stuck bolt ?

Postby int3man » Sun Feb 11, 2018 9:03 pm

Gen II rifles look like the air tube is machined with a nibbler. Fill the hammer pin slot with a small flat file. Debur the bottom inside of the slot, and the sear slot. Then hone the hammer travel area with a well lubed 1 1/8 Ball home. Invest the $50 in a MDS hammer from Jefferson State Air rifles and don't look back. Lower cocking force.

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