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Quoted:
I understand the differences in between the 223 and 9mm AR15s. I have a few of each. The carbine/pistol buffer for the 9mm is heavier. What would be the effect/result of running a 223 buffer in a 9mm?
IIRC broken bolt stops and out of battery kabooms. The extra weight is needed to create the proper amout of time the bolt is locked.
I'm going to have to respectfully disagree with those comments.
Broken bolt stops are caused by bolt/buffer overtravel and there is a "fix" to reduce/eliminate that phenomenon and it will work with either a std. .223 or std. 9mm buffer.
In semi, I do not believe it is likely that a .223 buffer will cause out of battery kabooms, unless there is some other factor/s at play - very dirty gun preventing a round from chambering, super hot +P+ ammo is used, bolt is ramped, reduced power hammer springs, or whatever else is done that will make the bolt easier to blow back, thereby reducing the amount of time it will stay "locked".
Without knowing the other specs of the OP's 9mm AR, it is not possible to say what will happen when running a .223 buffer.
In my experience, with my 9mm AR's (semi, non-ramped bolts, 9mm or DPMS hammers, 9mm buffer, std. AR15/M16 action springs, reduced power hammer springs), running WWB or RemUMC factory ammo, I have not had any issues when running a .223 buffer. It does give the gun a little different feel because you have about 3 oz. less mass bouncing around inside every shot.