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  1. Constructor

    12.5" Pistol/SBR caliber choices

    I'm waiting on Blackstone Arms to get some 14.5" 6.8s in now.
  2. Constructor

    sig mcx virtus barrel (weird?) hole

    Sig uses a recessed crown with a 45* chamfer and they are not concentric, the chamfer on one side was twice as long as the other side. Mine was shooting 2-3 MOA with IMI and S&B 77gr ammo but 4+ with other. I cut the barrel down to 14" and recrowned it with a single point cutter, 11* and no...
  3. Constructor

    .223 Wylde SPR Barrel Selection- 16" QPQ vs 18" Stainless

    Nitride/ QPQ barrels will last longer than stainless and generally do not copper foul as bad, some 5R are also 60-90fps faster. If the barrel isn't a real match grade barrel(Krieger, Bartlein, Hart, Shilen, Lilja, Douglas) I see no reason to buy a stainless.
  4. Constructor

    Your best groups consistently from a gas gun

    I've been using the 69SMK with 24.5gr RE15 or Varget with the 69 set to 2.28" for over 20 years. I don't use CHF or chromelined barrels but SS or Nitride with a Wylde chamber should do 1/2" easy. I've used Kriegers DCM (20")short chambered barrels that you have to finish the chamber and crown...
  5. Constructor

    Precisions ar upper? Build help….

    Back in the 90s most AR15 parts were poor quality so if we wanted one to shoot well we had to make them work. Derrick Martin at Accuracy Speaks was probably the first guy I knew that lapped the receiver face and bedded the barrel extension with plain blue loctite. It worked then and still does...
  6. Constructor

    Precisions ar upper? Build help….

    I don't know, They have always been tighter than the others until BCM started making theirs tight on purpose and Mega /Zev started teflon coating their receivers. Some of it also depends on the maker of the extension, some etensions come out on the large end of spec and some on the small end.
  7. Constructor

    Precisions ar upper? Build help….

    If you look at both the BCM 2 and the Vltor you can see BCM beefed up their receiver similar to what Vltor has been doing for 15years.
  8. Constructor

    12.5" Pistol/SBR caliber choices

    Try 28.4gr 2200 with the 110s, some load them to factory length of 2.26 others load as long as possible 2.295" It's posted as a favorite load over on 68forums.
  9. Constructor

    SA Scout Squad - Dot or Scope? Which do you prefer in Scout configuration?

    HAD one. If you add any optic of any weight on the forward rail accuracy is out the window. The only thing I would mount on the forward rail is a light red dot. That rail clamps around the middle of the barrel...bad design. If you want to mount a scope I would use the normal receiver mount...
  10. Constructor

    Best 12.5 barrel?

    Bill Waites one of the main guys of the Grendel forum around 2010 posted a photo on barfcom of a 120gr TSX recovered from a deer he shot, the bullet had not expanded even 30% and several others chimed in with other bullets that did not expand. So yeah it's easy to say all of those high BC...
  11. Constructor

    12.5" Pistol/SBR caliber choices

    Try 29.2gr RE7 with 85 and 90 gr bullets, that was one of the first universally accurate loads we found in 2008. Other powders work fine for accur acy but to get top velocity powder in that burn range needs to be used RE-7 to 10X. The bad part is Alliant powders are now running about $50/lb...
  12. Constructor

    Best 12.5 barrel?

    Rather than you saying what velocity you get and me saying what I get I would rather used published sources that can be verified. As you can see from the Hornady ammo pages they use a 24" Grendel barrel and a 16" 6.8 barrel. At a gain or loss of apx 25fps/inch we can subtract 200 from the...
  13. Constructor

    Best 12.5 barrel?

    Most 6.8 guys are hunters not snipers, they don't care much about BCs or shooting paper at 800yds.
  14. Constructor

    Nothing like a brand new rusted barrel, didn't even need to scope this one! :)

    For a long time Shaw was making their barrels, you can tell the difference because Shaw used 11* crowns and they were pretty accurate. Shaw doesn't drill gas ports. If Wilson really is making their barrels in house now then there is the change. The new barrels they are selling have a 45*...
  15. Constructor

    Best 12.5 barrel?

    I see your photos and slanted charts and raise you a video...or 2...or 3 Buffman armor testing short and long barrels. Personally I don't care what anyone uses, I have 12.5s that are faster than most 16s and 16s that are almost as fast as most 20s. 55fmjs for practice and MK318 and 62GDs for...
  16. Constructor

    Best 12.5 barrel?

    Agree, now that the pistol brace rule has been changed I think the sale of shorter barrels will drop significantly.
  17. Constructor

    Best 12.5 barrel?

    A few articles about terminal performance of bullets from DOC GKR and others relating velocity and barrel length.- edited to pick out a few paragraphs. Velocity matters, unless you're just shooting paper. https://www.itstactical.com/warcom/ammunition/military-ammunition-failures-and-solutions/...
  18. Constructor

    Precisions ar upper? Build help….

    Vltor Mur, BCM 2 if you can find one, Mega/Zev . First 2 have thicker walls and a tight fit. Mega /Zev has a tight fit.
  19. Constructor

    What's the best performing 223 AR load/bullet if you had to choose one?

    All of Alliant powders have gone way up close to $50/lb. I changed a bunch of loads over to AA2520. OP, Which cost less, 62 Gold dots, 69SMKs, 75 Hornadys(hpbt), 77smks?
  20. Constructor

    Nothing like a brand new rusted barrel, didn't even need to scope this one! :)

    I built a 6.5-08AI and a 30* 243AI because of that article, less than a year later work got in the way so I know what you are saying.
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