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Discussion Starter · #1 ·
Hello, my son got a 99M1 from my dad that got it from his dad. My son and I took it apart and cleaned it real good and replaced a broken buffer. He loves this gun but it jams almost every 3-4 rounds. It chambers the round most of the time but the spent casing is still in the action. Thanks for any help. PS: Where's the serial numbers on these guns?
 

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As posted above, the ejector wire most likely needs to be adjusted. It should sit the thickness of a nickel above the feed throat and to the right the same amount.

The 99M1 was made 1964-1978, so before 1969 there will be a 2 letter date code on the left side of the barrel.

A = Jan.
B = Feb.
C = Mar.
D = Apr.
E = May
F = June
G = July
H = Aug.
I = Sep.
J = Oct.
K = Nov.
L = Dec.

F = 1962
G = 1963
H = 1964
I = 1965
J = 1966
K = 1967
L = 1968

Lastly, what ammo are you using? My 99M1 and other Model 60s do not like any Federal (and American Eagle) or the Winchester bulk ammo. They run on Remington Thunderbolts and Golden bullets, but I get the best results with CCI Standard Velocity, Blazers and Aquilla.
 

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Ok. Is that spot in the center of the bolt normal? It seems that my feed throat is a 2 piece which is different than the one in the article, also the lifter spring isn't long enough to come to the top.
I can take a look at the bolt I took out of my 99M1. I put the internals including the bolt from a 1983 Marlin 60 mated up to the 99M1 side plates into mine. so I have the 99M1 bolt at home. Unfortunately, I'm heading to the airport for a business trip to California and won't be home until Friday.
 

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Forgot about this, but was working in a different 60 and dug out the bolt from the 99M1 from 1969. Same hole in the bolt. So I would say normal.

 

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Discussion Starter · #11 ·
Update: Feed throat conversion installed. Used new style bolt bought off eBay installed so I didn't have to modify the feed throat. Runs like a CHAMP. We love shooting it so much that I bought a Glenfield Model 60 squirrel stock to shoot with him. It needs conversion too but I wanted an older model. Thanks for the help gentlemen.
 

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Update: Feed throat conversion installed. Used new style bolt bought off eBay installed so I didn't have to modify the feed throat. Runs like a CHAMP. We love shooting it so much that I bought a Glenfield Model 60 squirrel stock to shoot with him. It needs conversion too but I wanted an older model. Thanks for the help gentlemen.
Good news. My 99M1 has the internals from a 1983 Model 60. That '83 gave its guts to the 99M1, its receiver and barrel to a 995 and its stock got cut down for an 11 year old to use on a model 70.
 

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Discussion Starter · #13 ·
Good news. My 99M1 has the internals from a 1983 Model 60. That '83 gave its guts to the 99M1, its receiver and barrel to a 995 and its stock got cut down for an 11 year old to use on a model 70.
Nice. I just installed a complete lsho assy into the 69 Glenfield. Had to dremel the tabs a tad because it was binding the bolt. Now, whenever I snug up the takedown screws it binds up again. I'm thinking about putting all the internals into the old side plates and dremel the slot for the bolt release. They are a lot thicker.
 

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... I'm thinking about putting all the internals into the old side plates and dremel the slot for the bolt release. They are a lot thicker.
That's exactly what I did for my 99M1 with the internals from the 1983 Model 60. I reused the 99M1 sideplates but everything else came from the 60. No last shot hold open on the '83, which is why that one got sacrificed like it did.

Matt
 
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