What is the difference between the Colt 6920 compared to the Colt 6721 other than the 6721 has a heavy barrel and a 1x9 twist?
What is the difference between the Colt 6920 compared to the Colt 6721 other than the 6721 has a heavy barrel and a 1x9 twist?
barrel profile, twist ratio and rollmarks
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The Armory:
Colt 6601 - Colt 6731 - Colt 613 - Steyr StG.58 - M1 Carbine - Galil SAR - CZ Scorpion EVO - Franchi PA8 - Glock 17 - Pietta/Colt SAA 1873 - SA 1911A1 Mil Spec - Ruger LCP
The previous posters nailed it (twist, HBAR).
I've owned both. Still have the 6920 and would buy another in a heartbeat.
Didn't care for the extra weight of the 6721. Not one bit.
Is there an advantage to an HBAR vs an m4 profile in a 16 inch rifle?
Accuracy. The pic below shows a comparison between a Colt 16" HBAR and a Colt 16" M4 (government profile) barrel. Three 10-shot groups were fired from each barrel at a distance of 100 yards. The 10-shot groups were over-layed on each other using RSI Shooting Lab and the mean radii were calculated for the 30-shot composite groups.
All that is necessary for trolls to flourish, is for good men to do nothing.
My Colt 16" 1:9 HBAR far out shoots any of my M4 profile barrels from any maker. The weight difference means little to me.
I have a HBAR while other 2 friends of mine have a M4profile and a lightweight....all of 3 are 16'' Colt carbines.
during a dynamic shooting match I liked the extra weight of my hbar; the lightweight carbine recoil is too different for my taste.
but the M4profile is the perfect compromise.
*** Damn Proud to Be an American Ally ! ***
The Armory:
Colt 6601 - Colt 6731 - Colt 613 - Steyr StG.58 - M1 Carbine - Galil SAR - CZ Scorpion EVO - Franchi PA8 - Glock 17 - Pietta/Colt SAA 1873 - SA 1911A1 Mil Spec - Ruger LCP
I had to trade my 6721 because my daughter needed to shoot out to 600 yards. The 1 x 7 twist handles heavier rounds better than the 1 x 9.
She used the my 6920 during her first match last June, afterthat I traded the 6721 for a RRA NM4....
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