The 6920 is - look for the knobs to remove the carry handle.
What will you do with it. What range, what target? What's pictured in the 6920 is a 5-300m infantry assault rifle, just semi auto for civilian sale. In 5.56, ammo will be cheap, but not necessarily adequate or even legal for hunting.
Not saying you can't, just pointing out what it is and isn't. It's not optimal for much in the way of hunting OR precision shooting. It's an M4gery, and in real life around the house or ranch, a lever .30-30 would suffice.
First decision - paper, live targets, or both? How much ammo for each annually? If it's a dirt blaster, stick with 5.56. Live game with a trip to the range to sight in, then a larger alternative caliber, which might be a mandatory choice.
The question "Which AR?" is answered "What range, what target?" Then the cartridge and barrel length is settled, and that specifies the gas. An A3 flattop allows any sights or optic, then the stock becomes obvious - and lots of us like fixed stocks on hunting, varmint, and long range rifles. The adjustable M4 is just the current fad - the AR15 has sold more fixed stocks, and the M16 has millions more fixed than adjustable.
Since the accuracy question was answered up front, then anything over 1MOA -hunting, dirt blasting, etc only needs common handguards. A CNC railed free float is a $300 light mount, an institutional compromise to accomodate the Army inventory of SOPMOD gear. It's not going to improve a milspec standard 2MOA issue barrel any, just keep hand or sling tension pushing it off the POI. And 2MOA is a ten inch circle at 500m, about half the size of the lethal hit zone on 150 pound live targets.
Analyze it, there really is very little return for the cost of a quadrail. Even KAC - the contract supplier - has said it's not the best choice for civilians. Why some can't accept that as an insider's honest opinion, from a knowledgeable issue supplier, I don't know. Agenda I guess.
Same for triggers - lots of noise about great triggers, but almost no documentation they can actually do any good on a 2MOA gun. What I think gets in the way is typical male enhancement therapy, I've got one and you don't. A trigger adjustment screw will do 80% of what a $250 trigger does, eliminate a lot of slack in the trigger pull, and because it doesn't scrape over it, a lot of grit, too. Most triggers sold as target models also have light pulls - which are oversold. A short, smooth 6 pound trigger has advantages in safety in the field that a 2 1/2 pound target trigger can't offer. Hunters get tired, drop guns, have them fall over, haul them up ropes into trees, etc. No place for light triggers, and the milspec standard is 6-8 pounds. Soldiers shoot each other as it is.
What range, what target? After that, there's usually just two or three that offer the particular combination, and the list of features optimum for that kind of shooting. We do the same thing buying a car - how many will we need to seat, how far will we drive, what kind of weather, what kind of road. A mom hauling her four kids to the bus stop in front of the ranch in 12" of snow during a South Dakota winter would choose a different car than a young guy commuting an hour across town in a Florida metro.
What's funny to see is either obstinately sticking to the other car when it's obvious they don't have a clue.
So... Where do I start?
