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So that rifle has a SOCOM barrel profile, and The Colt SOCOM barrel is a medium contour barrel which was produced to bridge a gap in the M4 Carbine's ability to handle full auto fire. The thicker Socom profile handles longer strings of full auto fire than its skinny predecessor. From what ive read on the AR15.COM forums the SOCOM barrels are in compliance with MD requirements, and you should be good to go, double check with your FFL to make sure A SOCOM barrel will work.

Yes, it will get sent back.

If your FFL says it won't go Here are 12 in stock MD compliant AR15's https://atlanticfirearms.com/taxons/ar15-rifles?criteria%5Bavailability%5D=in_stock&page=1

Michael, this rifle has a SOCOM barrel which is not MD compliant : https://bravocompanyusa.com/bcm-standard-16-m4-socom-barrel-stripped/ --------------- MD compliant HBAR barrels have no cutouts : https://www.brownells.com/rifle-parts/barrel-parts/rifle-barrels/ar-15-m16-hbar-rifle-barrels-prod78011.aspx ---------------- Example : https://www.budsgunshop.com/product_info.php/products_id/20388/radical+firearms+fr16762x39hbar12fgs+ar-15+fgs+semi-automatic+762x39mm+16+no+magazine+black+6-position+adjustable+synthetic+st

I was looking at Bravo Company Manufacturing's website to answer another question on here Nd noticed they have a few uppers that have heavy barrels and BCM is top notch at fair prices, you might want to check them out, for the money they can't be beat https://bravocompanyusa.com/ar15-upper-receiver-groups/