Marlin model 99 M1 Question

[Huffmanite]

I've had my Marlin 99 M1 22LR since mid 1960s and dispite proper cleaning, using different brands of ammo and etc., it frequently stovepipes the spent brass.  Thinking about buying a "feedthroat conversion kit," to solve my problem, from Numrich that includes the:  feedthroat, ejector lifter spring and cartridge lifter.  I'm curious if with this kit, is it also necessary to replace the BREACH BOLT?

[DennyRoark]

I had mine for years. til i got stolen.  Found that it needed regular, thorough (removing the bolt) cleaning.  Over the years, at the first jam, I would totally dissasemble and clean the area behind the bolt.  Usually 2 to 3 times a year depending on how much I shot it.  This would always solve the problem for a while.  I loved that rifle more than any other I've ever owned, but hated that part with a passion.  Unburned powder tended to build up in that area for some reason unbeknownst to me....

[Huffmanite]

Denny Roark,  Thanks for a speedy reply, but I neglected to mention in my first post that a good cleaning of action will not solve my jamming problem, nor will trying different 22LR ammo and etc.  This is why I'm trying one of the conversion kits with new parts to try to solve problem.  I have a lot of fond memories of squirrel hunting and plinking with this rifle when I was a teenager and would like to get it to be a reliable shooter again.

[Huffmanite]

OK, received the Numrich Marlin conversion kit and installed its three parts.  I did have a clearance problem of new feed throat with my original breach block.  Metal removal along top outer edge of the new feed throat solved the clearance problem.  Will be a few days before I can shoot rifle to see if my jamming problem solved.

[Huffmanite]

Continuing saga with my Model 99 M1.  Shot around 40 rounds of various 22LR ammo at 50 yard target last Sunday.  Good news, not much left of 1 1/2" bullseye on target.  Bad news, no improvement on jamming problem.  However, wear marks on area of the new feed throat I had to alter revealed addition metal removal necessary.  Also did a little inletting on feed throat groove where ejector spring rests for it to fit better.  Tinkered with extractors on breach bolt: removed both, cleaned, and did very minor filing/polishing on sharpest of the two extractors.

Curious about my newest tinkering on action, shot 10 rounds of Aguila subsonic ammo into ground a short while ago.  I live in an unincorporated area and few neighbors I have probably wouldn't have noticed my shooting with the subsonic ammo. Still had two stovepiped spent brass, but this was an improvement.  At range Sunday, stovepiped about every other round.  Think most shots without jamming was 3.

Think I'll remove extractors again and stretch their springs. 

[DennyRoark]

The problem might be in your magazine....I've got a 10-22 these days and one mag I have jams all the time.  Try chambering a round, then removing the mag for 10 or 20 rounds.  PITA, but if it works, you found the problem.  Hope you get it figured out soon....

[moorepower]

How does it work with high velocity rounds?