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9/22/2017 12:11:25 AM
Posted: 12/9/2003 12:02:49 PM EDT

I am going to be swapping the upper receiver on my Sporter lightweight with an M4 flat top. I will be using the Sporter barrel, bolt and carrier.

How important is it to check the headspace when I do this? Seems to me it should all just work, but what do I know.

I am just trying to avoid spending the money on or finding the headspace gauges to borrow.

TIA,

Link Posted: 12/9/2003 1:42:07 PM EDT
If you are using the same barrel and bolt, the headspace won't (can't) change. As long as it goes into battery, you are good to go.
Link Posted: 12/9/2003 10:13:17 PM EDT
That's what I thought but I had to check. Thanks, Matt
Link Posted: 12/10/2003 6:24:31 AM EDT
The lower is nothing more than a way of striking the firing pin in the upper's bolt.
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