Furthering the Legacyone part at a time

Have questions? Call: 866-686-7424

Forum > Gunsmithing > Gunsmithing > Mossberg Model 151(b) 22 cal semi auto long rifle

Mossberg Model 151(b) 22 cal semi auto long rifle

Author Message
Roy Mcleod
Joined: June 2010
Posts: 53
Posted: February 13, 2011 05:29 PM
One of our favorite plinkers, just stopped working!! NOW the trigger will not cock, wnen the cocking knob, is pulled to thr rear. NOW cocking knob, will not lock in the receivers slide area, rear hole.Knob stops short app 1/16 inch from hole. So bolt, spring and fireing pin assy CANNOT, be removed from receiver. Do I, have a broken fireing pin problem here? Is, this a problem I, can handle, or is a Gunsmith needed? Thanks Roy
Ezequiel
Joined: August 2011
Posts: 5695
Posted: February 14, 2011 09:26 AM

The people to ask are Vic and Cheryl Havlin at www.havlinsales.com..they run the Mossberg Collector's Assn and buy and sell parts for obsolete models...so..they can advise and likely supply you with any parts you need....However..FIRST..do this..do a detailed breakdown and cleaning and this is a CA 1950's production rifle a rough guess would be a spring failed..like the sear/disconnector spring or the Trigger return spring..maybe the main spring or MS assy has failed..If one of theses failed...broke off..then the pieces could keep the bolt from a full cycle a common problem is a failure in the feed sysytem...even if it is just dirty, things like the cartridge cut-oof or even the tension spring has failed..Point is, you can't tell untill you take it apart..You can find takedown instructions in The Gun Digest Book of Firearms Assembly/Disassembly Part III: Rimfire Rifles..My older edition shows the Mossberg Model 151M(M=Mannlicher stock) FWIW the Model 151 is typical of Mossberg autoloading .22 rimfire rifles and these instruction can get you thru just about any of the obsolete versions.The book I have shows the model on page 111

Roy Mcleod
Joined: June 2010
Posts: 53
Posted: February 14, 2011 06:39 PM

Zeke:

Many thanks for your help and info!! I, will start with Havlins and follow all your instructions. If all fails, Iwill take it to my GunSmith!!

Thanks again

Roy

Ezequiel
Joined: August 2011
Posts: 5695
Posted: February 15, 2011 09:24 AM

Just so you don't get discouraged...it took me the better part of 6 months to get this design to function..as I recall, the end cap on the back of the reciever(a sloped plastic piece) that is threaded in to the reciever cannot be fully seated...most times it will be off clock position and if it is to far forward it will restrict bolt travel just enough to give cycle problems and if to far out..the recoil spring assy loses horsepower..as i rcall..a .030 to .060 gap between the reciever and the cap is what I worked with..Sadly..i didn't write it down..so this is just my (pss poor) recollections....

Curtis Childress
Joined: January 1900
Posts: 84
Posted: February 15, 2011 04:07 PM

Was that a 151(B) or a 151M(b) ? My references do not show a 151(b) in Mossys- but there are some gaps in there. And I'll second what Zeke said about Vic and Cheryl Havlin. Really nice folks, and have kept my Mossbergs working.

Half the people you meet are below average
Roy Mcleod
Joined: June 2010
Posts: 53
Posted: February 16, 2011 04:16 PM

Curtis:

Thanks for your help!! I, checked again . The model is 151M(b). I am sure Havlin can help, w/ my problem.

I, have to add I, always take Zeke's advise!!

Roy

Ezequiel
Joined: August 2011
Posts: 5695
Posted: February 16, 2011 05:23 PM

Roy, Thank you for the vote of confidence....but...there are at least 3 ladies who would laugh and laugh loudly at even the thought of doing that...even in jest!!!

Curtis Childress
Joined: January 1900
Posts: 84
Posted: February 17, 2011 01:46 AM

Roy- I THINK the 51M and 151M strip in a similar manner. This is a link to an original 51M instruction sheet- you will need to enlarge it. If you can release the catch at the rear, draw bolt back, and slip bolt handle out, you can pull the rest. Good luck, and keep the Mossys shooting- http://www.box54.com/inst-model-51mb.jpg

Half the people you meet are below average
Roy Mcleod
Joined: June 2010
Posts: 53
Posted: February 17, 2011 06:00 PM

Curtis:

You are right they do strip down in a similar manner Many thanks, for the instruction sheet. when magnified to 400%, I, have everything I,need once I,

get the S-b cocking knob removed, from the receiver!!

Thank again

Roy

Curtis Childress
Joined: January 1900
Posts: 84
Posted: February 17, 2011 10:12 PM

The firing pin locks the bolt handle in place. Pull the spring and striker, and the FP should move back- could be crud keeping the FP forward. It has a small bit that sticks down and fits into the bolt handle groove. Maybe a couple of drops of oil or penetrant (I like Kroil) to help it move. Good luck-

Half the people you meet are below average