FN uses a good cold hammer forged barrel. Don't go about ruining it.
Getting another barrel wouldn't be ruining it. Changing barrels on the SCAR approaches the trivial.
1. Loosen 6 captured bolts with the supplied torque wrench, slide old barrel forward and out.
2. Slide new barrel in and tighten the bolts down to ?63? inch pounds.
3. There is no 3. All done.
Check out the video. It's a pretty cool system. No headspace fiddling etc:
http://www.youtube.com/watch?v=zvntovQ9-PE
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