Geissele Super Duty MOD1 5.56 NATO 13.9" 1:7" CHF Chrome Lined Pinned & Welded Bbl Black Complete Upper Receiver Group 08-546B

Geissele Super Duty MOD1 5.56 NATO 13.9" 1:7" CHF Chrome Lined Pinned & Welded Barrel Black Complete Upper Receiver Group (08-546B) is a duty-grade upper built to exceed expectations in both reliability and performance.

This Geissele Super Duty 13.9 upper runs a 13.9" cold hammer forged barrel, chrome-lined for maximum durability. The 1:7 twist stabilizes a wide range of bullet weights, from light varmint rounds to heavy-duty defensive loads, and the barrel is pinned and welded out to a legal 16" overall length.

This Geissele 13.9 Super duty build includes a Nanoweapon-coated Reliability Enhanced Bolt Carrier Group for exceptional resistance to wear and corrosion. An ambidextrous Airborne Charging Handle improves manipulation under stress, while the MK16 Super Modular Rail delivers a slim, rigid platform with extensive M-LOK real estate.

Key Features:

• 13.9" cold hammer forged, chrome-lined barrel, 1:7 twist, pinned & welded to 16"
• Geissele Profile barrel contour
• Reliability Enhanced BCG, Nanoweapon-coated
• Airborne Charging Handle (ACH®)
• MK16 Super Modular Rail
• Type III hardcoat anodized black finish
• 5.56 NATO chambering
• Ready to mount on any mil-spec AR-15 lower

This Geissele upper receiver hands builders a complete, duty-proven foundation without requiring a separate parts hunt for the internals.