What goes into an accurate AR upper?

Discussion in 'Rifle Country' started by brewer12345, Mar 16, 2022.

  1. mavracer

    mavracer Member

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    See that's the thing I have similar results without lapping or bedding. Haven't used a Larue but Faxon and Ballistic advantage shoot close to MOA with factory SMK loads. I've got a WOA barrel that shoots lights out with 77 SMKs. I've also got a 224 Valk with an ARP barrel and a 6mm Creed with a Brownell's barrel (I think they're Krigers). That both shoot 1/2 MOA ish with factory ammo.
    So I just wonder how much it helps.
    I only use handguards that clamp to the barrel nut anymore, no shims just torque the nut to spec and go.
     
    Chuck R. likes this.
  2. someguy2800

    someguy2800 Member

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    I’ve had $79 barrels that shot sub moa, but I’ve also have many more that wouldn’t. Spending more money with a precision barrel builder greatly increases your probability of getting a good one. If you order a budget barrel you have might have a 30% chance or something like that of getting a really good shooter. If you get a bartlein it’s more like 99.9%
     
    Chuck R., Skylerbone and mavracer like this.
  3. mavracer

    mavracer Member

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    I agree as long as you stay inside the box 5.56 shooting the very forgiving 77 SMKs odds are pretty good that budget barrel will shoot ok.
    Try shooting the less forgiving 80+ in a Valkyrie and budget barrels will struggle to hit your 70% shooters mark.
    My first Valkyrie barrel would shoot the cheap AE 75 FMJ and Hornady Black 75 HPBT pretty good but stick 88 ELD-M or 90 SMKs and poof 3 MOA.
     
  4. P5 Guy

    P5 Guy Member

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    I live in walking distance of the Tampa Bay and have never seen that either.
     
  5. BreechFace

    BreechFace Member

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    I lap all my upper receivers. It also helps with lug alignment to the barrel extension in addition to the aforementioned tuning to a specific torque range if the handguard needs the gas tube in a specific placement to the barrel nut.

    Like was said by others it takes a minute or two to lap the upper and it’s a piece of mind especially when one finds an upper receiver that shows the benefit of lapping the face. Most receivers I lap have shown an off plumb cut based on the semi-circle material removed from the face which would if left untapped caused bolt lugs to be not square to the barrel extension causing some lugs to engage sooner and take more of the locking force as well as input a variable in the support of the cartridge as it ignites.

    But apart from tuned ammo to the particular barrel, the barrel, tight barrel to receiver and free float handguard are going to be most important.

    A good trigger definitely helps but could be over come by a shooter with great trigger pull skills.
     
    Last edited: Mar 21, 2022
  6. bfoosh006

    bfoosh006 Member

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  7. citizenconn

    citizenconn Member

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    I look at this a little different than most folks. If you have decent parts, then there is not an appreciable difference between a high end vs a budget AR other than cosmetics and a little rattle, excepting the barrel and trigger. Everything else is window dressing. A good barrel, a quality trigger (whether single stage drop in or well made two-stage) and some decent optics along with a little practice can turn Joe Schmoe into Carlos Hathcock.
     
  8. euclid

    euclid Member

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    Free float a good barrel and feed it quality ammo.
     
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