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  1. Constructor

    AR-15 headspace issue criterion barrel

    All it takes to fail is .001" but .001 may mean/do nothing. Try some loaded factory ammo in the chamber, if it fits shoot it. Most factory ammo is well below the size of the go gauge.
  2. Constructor

    How's the quality at PTR lately?

    I must have got a good one, mine shoots about 1.5 MOA with 149gr surplus and a little better with the 130gr MK319. The Springfield M1A I purchased around the same time shot more like 3 MOA.
  3. Constructor

    How's the quality at PTR lately?

    How many times has PTR been sold in the last 10 years? They moved to SC in 2013 or 14, my receiver is stamped SC.
  4. Constructor

    How's the quality at PTR lately?

    My latest 91 is 2-3 years old and is Nitride treated.
  5. Constructor

    Bolt Lug Deformation - Proof SS 6ARC Barrel

    T Around 2007-08 there weren't many manufacturers nitride/melonite treating barrels, LWRC was likely the first and I wasn't far behind. The places like L&M and Bodycote were telling everyone nitride treating barrels with the barrel extensions on the barrels was not a problem, it would not...
  6. Constructor

    Bolt Lug Deformation - Proof SS 6ARC Barrel

    Nitride bolt or Black Oxide? I've been telling people for several years that nitride treating bolts or barrel extensions is not a good idea. It softens the bolt and extension lugs and over a period of time they will compress leading to excessive headspace. Maxim description does not say if...
  7. Constructor

    Criterion hybrid that won’t shoot

    8 won't stabilize a 90gr SMK either, it you hunt a 70TSX matters but most don't use either. Everyone must make their choice based on the bullets they plan to use, I wouldn't buy a 7 twist if I'm shooting 38gr varmint grenades.
  8. Constructor

    How's the quality at PTR lately?

    No experience with the PTR32 but the 91 I purchased a few years ago eats everything.
  9. Constructor

    Pacific Tool and Guage

    If everyone cancels they make 15% for nothing.
  10. Constructor

    Sig Spear 7.62x51 is out and she's a porker

    Do they do anything? I mean I'm not using a PEQ to shoot 600yds and at 100 it's accurate enough to stay center mass.
  11. Constructor

    Sig Spear 7.62x51 is out and she's a porker

    Did you notice their fix is for the Virtus?
  12. Constructor

    Sig Spear 7.62x51 is out and she's a porker

    My LT doesn't move that much either.
  13. Constructor

    Criterion hybrid that won’t shoot

    Douglas have always been considered real match grade blanks. Douglas, Shilen, Pac Nor on the lower end Krieger, Bartlein, Lilja, Hart on the upper end, Broughton, Rock and some others have retired.
  14. Constructor

    Neck turning & ARs

    Benchrest and F class guys use special chambers with tight necks to make the brass last longer, less expansion from the factory size. Turning the necks apx 80% will provide a clean release of the bullet. This book goes into great depth about loading for extreme accuracy-
  15. Constructor

    Criterion hybrid that won’t shoot

    All I have used since 2000 has been 8 twist barrels, 69s and 77s both shoot well. I had a 22 cal wildcat based on the 6.8 case (5.56x42) that would shoot the 75gr Amax under 1/2" with 4-5 different powders. Jason Peterson shot a 4.5" group at 1200yds at Strategic Edge with the same type of...
  16. Constructor

    Neck turning & ARs

    Actually you want the bullet in the freebore to align the bullet on the bore, that is why the case neck is loose in the chamber.
  17. Constructor

    Best ar-10 under 1700 ish

    Good advice. Springfield isn't the same company now. I've had several M1As over the years and sold them for different reasons. I purchased the 16" SOCOM a few years ago without handling one first. The forward rail clamps around the barrel and there goes the accuracy. I sold it within 6 months.
  18. Constructor

    Criterion hybrid that won’t shoot

    There are usually 3 things that can cause problems, gas port through a land slices off more copper on one side of the bullet. Burr on the crown or crown off center if it has a 45* chamfer The muzzle has swelled where the 1/2" threads were cut but Steve knows about this issue and in the past has...
  19. Constructor

    ar15 barrel quality experience

    X-Caliber use to be Montana Barrels, they made all the barrels for DPMS.
  20. Constructor

    ar15 barrel quality experience

    Wilson Arms, not Wilson Combat
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