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Old August 6, 2011, 02:55 PM   #20
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Join Date: November 18, 2009
Posts: 120
Yes, the gas system on the carbine is supposed to run dry. As a matter of fact, it's really not ever even supposed to be disassembled (except at the "armory" level of maintenance). The G.I. carbines all have their gas pistol nut staked.

Are you using factory ammo or reloads?

Another thing that can cause the carbine to short stroke is cartridges that have been reloaded but not trimmed to length (or maybe a dirty chamber?). The carbine headspaces on the case mouth, and if the case is too long it prevents the bolt from going fully forward. This, in turn, prevents the slide from going all the way forward.

Because the carbine uses a short stroke gas piston, if the slide is not all the way forward part of that short piston stroke is "wasted", since the gas piston uses up part of it's travel just to reach the slide.

If this is what's happening, this is your carbine trying to warn you of a very dangerous situation - you may be approaching an out-of-battery discharge.

G.I. carbines had some designed-in features that prevented out-of-battery discharges - a tang on the firing pin that had to pass through a slot in the receiver bridge to reach the primer, and a cam surface on the hammer that interacted with the bolt so as to either rotate the bolt the rest of the way, or that would arrest the hammer in its travel. Some commercial carbines either eliminated these features entirely (late model Universals) or just had them far enough out of spec that they were not entirely effective. So be careful out there.
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