M1 carbine Bolt question
- Thread starter gunsdora
- Start date
Dirtiestharold
Regular
- Location
- Toronto the good?
Did you have an issue with your original bolt?
OP, I have. They just drop right in. IF YOU HAVE ONE OF THE FIRST GENERATION MODELS.
If you have the receiver with two return springs and the open slotted guide rod, they may not fit.
The first generation Universal M1 will take either the round bolt or the flat top.
The first generation Universal rifles used a lot of US GI surplus parts. The following generations used a lot of proprietary parts.
If you have the receiver with two return springs and the open slotted guide rod, they may not fit.
The first generation Universal M1 will take either the round bolt or the flat top.
The first generation Universal rifles used a lot of US GI surplus parts. The following generations used a lot of proprietary parts.
Best resource I found to figure out what was mine made of:
http://www.m1carbinesinc.com/carbine_universal.html
http://www.m1carbinesinc.com/carbine_universal.html
Round or flat bolt doesn't matter. GI round and flat bolts are interchangeable with each other in a GI carbine.
The main difference with the Universal, as I recall is the firing pin. The late production round bolt Universal firing pin is not free-floating like the GI bolt - it has a spring in it (safer in one respect) but as I recall, the Universal firing pin does not have the timing "leg" at the bottom. If the Universal receiver doesn't have clearance for this it will be a problem.
There is also a divot cut into the bottom rear of the late pattern Universal bolt to engage the unreliable bolt hold open lever system that is unique to this model.
From: http://www.m1carbinesinc.com/carbine_universal2.html
The main difference with the Universal, as I recall is the firing pin. The late production round bolt Universal firing pin is not free-floating like the GI bolt - it has a spring in it (safer in one respect) but as I recall, the Universal firing pin does not have the timing "leg" at the bottom. If the Universal receiver doesn't have clearance for this it will be a problem.
There is also a divot cut into the bottom rear of the late pattern Universal bolt to engage the unreliable bolt hold open lever system that is unique to this model.
From: http://www.m1carbinesinc.com/carbine_universal2.html
Last edited:
maple_leaf_eh
CGN Ultra frequent flyer
One time I traded for a commercial Carbine copy that had fired out of battery. The stock split, the magazine was dumped off, and the locking lugs broken off the bolt. No other damage. I replaced the broken parts and sold it on.
How it could fire out of battery always challenged my troubleshooting. The only way would be if the firing pin tip had stuck forward when the tail had not been cleared out of alignment by the internal receiver bridge. A poorly made bolt/firing pin/receiver seemed most likely. With replacement USGI parts, I would have more confidence than with all commercial parts.
How it could fire out of battery always challenged my troubleshooting. The only way would be if the firing pin tip had stuck forward when the tail had not been cleared out of alignment by the internal receiver bridge. A poorly made bolt/firing pin/receiver seemed most likely. With replacement USGI parts, I would have more confidence than with all commercial parts.
fingers284
CGN Ultra frequent flyer
- Location
- Alberta Cowboy Ranges
I have to ask...how would the locking lugs break off in an "out of battery" discharge...they would just be unhooked & sliding on frame rails would they not? sounds more like a double charge in a handload to me to cause that damage.
Round or flat bolt doesn't matter. GI round and flat bolts are interchangeable with each other in a GI carbine.
The main difference with the Universal, as I recall is the firing pin. The late production round bolt Universal firing pin is not free-floating like the GI bolt - it has a spring in it (safer in one respect) but as I recall, the Universal firing pin does not have the timing "leg" at the bottom. If the Universal receiver doesn't have clearance for this it will be a problem.
There is also a divot cut into the bottom rear of the late pattern Universal bolt to engage the unreliable bolt hold open lever system that is unique to this model.
From: http://www.m1carbinesinc.com/carbine_universal2.html
Quiet
Thanks for the info. Now I see how it works. If the cut in the receiver for the tail of the G.I. firing pin then you mite be able to use a G.I. bolt. Just need to check the head space.
The right lug usually shears during an out of battery detonation because for the m1 carbine to come close to firing, the lug will at least be partially engaged. With the pressure of the round going off, it will most likely shear. The m1 carbine "should" not fire or detonate a round with the bolt completely open in any way unless you somehow have a really long firing pin. Also in a out of battery detonation, the slide will most likely not be fully seated therefore the piston may not reach the slide. The bolt will have full rearward force without any rotation and minimal lug engagement most likely causing the shearing.
