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Thread: Shaw 300 Ham’r complete upper

  1. 04-04-2021, 04:53 PM #1
    bearbud
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    Shaw 300 Ham’r complete upper

    I am interested in buying the Shaw 300 Ham’r complete upper for shooting CB exclusively. What they advertise as a complete upper doesn’t include the bolt carrier group (BCG). Upon calling them raising concerns of headspace variations, they assured me that using any “per spec” BCG group will work safely with this upper. Knowing modern manufacturing techniques and the use of tolerances, I am very skeptical but I only assembled three 223 AR15 rifles before (in all of them I did check the headspace with the correct gauges). Since I am not interested in buying the 300 Ham’r gauges, I wonder if what they are telling me is correct. Is there no need to check headspace on AR15 style rifles when using reputable per spec parts?

    Bearbud
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  2. 04-09-2021, 10:44 AM #2
    popper
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    As you will be shooting cast I assume you are reloading so set your HS with your sizer/trim die. Same as pistol due to HS on the mouth.
    Whatever!
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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check