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  1. sinister

    U.S. Army/Navy/USMC M14-based sniper and DMR/SDM rifles circa late-1960s to late 201Xs

    Note the Small Caliber Data Sheets post the "Ideal" loading, while Lake City Army Ammunition Plant might have daily, weekly, or monthly deviations due to differences in primer and powder lot performance to meet military acceptance. M118 Special Ball designation came once Lake City could no...
  2. sinister

    1/2 moa to 3-4 moa. Help

    What is your current round count? How many rounds do you shoot between cleaning?
  3. sinister

    AR-10 is chewing up my brass

    The long longitudinal scratches are probably from your magazine feed lips. Your primers have a raised rim around the firing pin indent but your primer cups still have a radius and are not flattened, while the case head has flowed slightly into the ejector hole. I would stop using Hornady brass...
  4. sinister

    Odd Winchester Post '64 Model 70... Possibly Custom Shop?

    For comparison, a Winchester (Army contract) production rifle:
  5. sinister

    XM7 worries from the field.

    Just eyeballing it, the conventional brass-case .276 (x 51.4mm) Pederson would be about the same dimensions as the hybrid-case 6.8 x 51mm (6.8 Fury). It would probably be the equivalent of todays conventional brass-case SIG 6.8 x 51 training round -- and thus fit into a short-frame AR-10...
  6. sinister

    XM7 worries from the field.

    If we're looking at Southeast Asia re: pure human operational factors -- there are reasons the lightweight and efficient M16A1 and CAR-15 were and still are so popular. It's hot and typically wet and / or humid in most places, some with hills and mountains. In many, humans are in heat stress...
  7. sinister

    Recommend me a muzzle device

    You could try a Witt Machine SME.
  8. sinister

    Waterline your Plates

    We used to call this concept "Center of Mass." Aim to hit where the target's the biggest. It doesn't necessarily give you a CNS hit -- but it gives you the highest chance of getting a hit.
  9. sinister

    XM7 worries from the field.

    The infantry (including Special Forces) may eventually be issued the XM7 and XM250. In my time I had a Big Army issued M16A2 musket and Beretta in the arms room in nice tidy racks. Directly across would be our camouflaged CAR-15s with doo-dads and .45s. Today it's M4s and Glock 19s. The same...
  10. sinister

    XM7 worries from the field.

    June 14, 2025 marks the 250th anniversary of the founding of the United States Brigade of Infantry and the United States Army. We had infantry and an Army before we had a nation. The side that runs out of fighting and resisting humans first dies. You want to take over a country, you kill...
  11. sinister

    XM7 worries from the field.

    You may very well be correct -- but wars are about politics, power, and control, and that is determined by people. At a certain point, even in Ukraine, one side runs out of machines, ammo, or combatants. A war ends when the weaker surrenders, is subjugated or enslaved, or goes extinct. I...
  12. sinister

    XM7 worries from the field.

    I don't think it really matters what caliber the weapon comes in -- the United States Army does a poor job teaching soldiers to engage targets at 300 Meters and beyond, let alone farther against a moving and turtled-up foe. I would beg to differ on the point of infantry. You may control the...
  13. sinister

    OAL for 7,62 NATO

  14. sinister

    XM7 worries from the field.

    You're absolutely right. They're not coming here, and we're not going to fight them within the borders of China. The United States is bound by six formal Indo-Pacific treaties with: Korea; Japan; Thailand; the Philippines; Australia; and the UK and Australia (AUKUS). We've told the world...
  15. sinister

    XM7 worries from the field.

    Imagine 1.4 million Chinese infantry equipped like us. Their basic rifle qualification starts at 200 Meters and closes to 100. The PLA is receiving the first of 1.4 million sets of SAPI plates this year. High-cut MICH helmets fielded in 2018-19. They're starting to get night vision. The...
  16. sinister

    XM7 worries from the field.

    SIG keeps winning Army contracts because they keep delivering exactly what the Army asks for. Nothing really sinister about it. Competition would win if they did the same thing, but aren't. Jason St. John came from 3rd Ranger Battalion and the Army Marksmanship Unit. He, Robby Johnson, and...
  17. sinister

    U.S. Army/Navy/USMC M14-based sniper and DMR/SDM rifles circa late-1960s to late 201Xs

  18. sinister

    Anyone Shooting a 40x?

    Nice AI summary: "Remington introduced the swept-back bolt handle on the Model 700 in January 1962. This was part of the overall design of the new rifle which included a more streamlined tang and graceful trigger guard. The bolt handle was further swept back in 1969, but changed back to a...
  19. sinister

    Old armalite hand guard

    everygunpart.com:
  20. sinister

    308 AR10 Build Info/Picture Thread

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