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I'm rather new to to AR-15 scene, and have read the so you want to buy an AR-15 sticky. Great read by the way. It shows the specs on the 6920. I have a chance to buy a 6721 at a great price, but can't find any true specs on it anywhere. The only diffrences I can see is the 6721 has a HBAR without the recess for the grenade launcher. I don't know if it has a chrome lined barrel and chamber. I don't know if it has M4 feed ramps. So, I was wondering if anyone could enlighten me on all the diffrences on the 2 rifles.

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The 6721 has 1/9 twist barrel w/ out the step for M203 grenade launcher. It has M4 feed ramps w/ chrome lined chamber and bore. If you are not going to shoot anything heavier than 68gr or so, the 1/9 twist should be just fine.
 
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