Moderator: MudBug
Texas Sheepdawg wrote:The 450B bolt is not the same size as the 5.56/223 bolt.
I'm pretty sure you will have to get one through bushmaster.
That is, if your original upper is a Bushmaster upper.
You might want to ask some of the more knowledgeable guys
On here, but you may have to lap a new bolt to the barrel also.
Let's see if they will weigh in on this.
Al in Mi wrote:looking to build a stainless barreled carbine upper.
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