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  1. sinister

    Navy NSWC Crane M83

    Not so much parochialism as capacity and availability. All Marine Corps M40s were custom-built by Precision Weapons Battalion 2112 Armorers and gunsmiths. Their schedules and capacity were full keeping up with internal demand. Starting in 1985, Army met their requirements by buying the...
  2. sinister

    Spotting scope mount - any recommendations

    Giraud:
  3. sinister

    New (to me) Remington 40X

  4. sinister

    MP5

    I have a three-digit MP5 SBR conversion originally sold as an HK94 as well. It has the original HK94 stamping on the receiver. The Form 4 and NFA Registry says it is an MP5 SBR. Simple Green and water make a good-fair solvent -- just be sure to rinse it off thoroughly and lube. As stated...
  5. sinister

    New (to me) Remington 40X

    If it's engraved "U.S." it's a surplused Army rifle (vice "USMC"). Yours looks like mine from around 2010 -- medium taper barrel and the Remington 700 back-swept bolt handle (as opposed to the straight 721-722 handle). It should shoot really straight and tight with almost any ammo. I paid the...
  6. sinister

    Precision AR -15 10 shot moa groups

    Take off the bipod and shoot off of bags. The longer lock time of an AR hammer trigger compared to a striker-fired bolt action is enough to throw off new precision AR shooters. Couple that with a wobbly bipod and you're giving away stability.
  7. sinister

    MK 12 Picture & Discussion Thread

    For DMRs and SPRs we don't shoot 80s for slow-fire. The majority of the ammo through DMRs will be M855A1. Through SPRs mostly 77s. Really depends on the customer and training audience. I think my last personal SPR barrels have been Satern Liberty, Roscoe, and White Oak. Wannabe SPR. Needs...
  8. sinister

    MK 12 Picture & Discussion Thread

    USAMU used/made both during my time there (a while ago). Depends on what blanks were in the supply room. Proof is in the performance. Every single USAMU build gets tested -- there's no wondering whether or not the build was right.
  9. sinister

    Ops inc adapter/ extension

    What is your finished barrel diameter behind the threads? Otter Creek Labs makes a one-piece thread-on mount that may do what you want (possibly the one Allegheny offered above).
  10. sinister

    Carbon Barrel cracked??

    Apropo of nothing, here's a rando vid (re: cryo treatment) on how Krieger does their barrels. Extreme cold shouldn't necessarily affect a well-done carbon fiber wrap based on aero and space applications.
  11. sinister

    FULL LENGTH SIZING AND BRASS HYSTERESIS

    The point of annealing is to stress-relieve the work-hardened neck and shoulders to reduce splits. Here's a case diagram (lower left) that shows the hardness gradient of standard GI 5.56 brass. As the cases are drawn you want the head to be hard and the shoulders and necks softer. For...
  12. sinister

    5;56 velocity change and don't know why

    How many rounds down the barrel? As your throat advances you'll get some blow-by. How old is the powder? All nitrocellulose powders start to decompose the moment they're manufactured. Diphenylamine is usually added as a preservative but it can't stop oxidation.
  13. sinister

    FULL LENGTH SIZING AND BRASS HYSTERESIS

    From Stevenson 's (and others), every time a case is sized the case grows and the case walls thin. It was interesting to read firing has more of a work-hardening effect than sizing. The spinning the case in a drill while holding to a torch flame (without a temperature or time standard) was...
  14. sinister

    A friendly accuracy challenge. Beat the match conditioned M14's/M1A's! (Piston-driven rifles)

    Great group and placement. Hun targets are tough as there's really no distinct aiming point to reference. The iron sight AR-10 and SR-25 left the long range M14 behind them almost 20 years ago.
  15. sinister

    FULL LENGTH SIZING AND BRASS HYSTERESIS

    Master's in Mechanical Engineering thesis by Ryan Stevenson: "Characterisation Study of Brass Cartridges for High End Competition Shooting," University of Strathclyde, 25/04/2014. I found it as a .pdf
  16. sinister

    The SIG 716I TREAD .308 may be the best AR-308 / AR-10 type battle rifle for the money.

    The Indians have ordered the second batch as of 26 August 2024. Link: Announcement Indian Army Orders an Additional 73,000 SIG716 Rifles NEWINGTON, N.H., (August 26, 2024) – SIG SAUER, Inc., is honored to announce a second procurement contract with the Government of India, Ministry of Defence...
  17. sinister

    FULL LENGTH SIZING AND BRASS HYSTERESIS

    There are a number of possible fixes for the poors who scavenge range brass or are gifted machinegun brass. Anneal first. 1. Try small base dies. 2. Try sizing first with a 30-06 small base body die, then size again with a 308 small base die. 3. Spend more money on a custom Warner Tool...
  18. sinister

    How has your mail service been lately? USPS thread

    Georgia mail service ranks last in the nation behind all states and territories according to the USPS Inspector General. They suck. It saddens me since my dad is a retiree of both the Army and the USPS. The postal service is not the same organization as when he worked there. A travesty as...
  19. sinister

    White oak armament accuracy

    Nez' barrels with the hard nitriding will keep you in really good stead for long life per barrel. My son is very happy with his. Nez turned a $40 Green Mountain blank into my son's superior 16-inch carbine barrel. ... to make up for de-railing, my son just bought a replacement White Oak...
  20. sinister

    Question for Forster Co-Ax press owners

    If you use a short handle and a throw limiter pin the handle will rest leaning toward the loader rather than the far wall -- more like this:.
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