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Posted: 4/21/2007 2:18:54 PM EDT
I want to change my A2 upper to an flattop. I will be using my old barrel, tube, and bolt. I was told that I do not need to head space the bolt to the barrel bacause the bolt "lock" onto the barrel, which I know. But I still think that I need to headspace. What do you think?

Bob The Nailer
Link Posted: 4/21/2007 2:22:51 PM EDT
Doing it wont hurt you. Not doing it might or might not. If you can afford to do it/have the tools why not?
Link Posted: 4/21/2007 2:42:58 PM EDT
No you do not need to headspace it. As long as you are using the same barrel & bolt there should be no need to.

If I am wrong, someone please enlighten me.
Link Posted: 4/21/2007 3:18:18 PM EDT
Since you are reusing the bolt and barrel, you don't have to check headspace.

I've done this same swap and had great results.

Have Fun,

Link Posted: 4/21/2007 3:27:27 PM EDT
I've done this swap a few times, no problems.
Link Posted: 4/21/2007 4:14:17 PM EDT
Great, I will ordering tools to do the job. I have the multi-tool, just need the flattop and the upper receiver tool.

Link Posted: 4/21/2007 11:17:46 PM EDT
Thanks to this forum I swapped receivers on my SBR going from A2 to A3, you will find all the info you need to. Be careful with torque values and check everything twice; THINK before and the operation is quite simple.
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