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  1. Everything you wanted to know about 5.56 / .223 ... well a heck of a lot of info for sure. http://ammo-oracle.razoreye.net/
  2. This link will tell you everything ( and more , Lol ) that you have ever wanted to know. http://ammo-oracle.razoreye.net/ Different Mil-Spec bullet designs, for different perceived threats. The M855 was meant to penetrate "Russian" steel helmets at extended ranges... IE the perceived threat of the '80's ( Just like we now have the M855A1... different perceived current threats... and the need for a different bullet design. ) "SS109/M855 NATO ball can penetrate up to 3 mm (0.12 in) of steel at 600 meters." M855 uses a 62gr bullet, with a steel insert in the front of the bullet and a lead core behind it in-cased in a copper jacket. The painted green tip ( on the M855 ) is meant to used for easy ID compared to a non-painted M193. NOTE... M855 bullet is the 2 left ones... the "New" currently used M855A1 is the 2 right hand ones. M193 use a 55gr lead core jacketed bullet. Surprisingly... finding a decent photo was difficult for me this morning Note the solid lead core. Open base.
  3. As mentioned, if you are just plinking with the M855 ammo it is certainly GTG. It will go bang every time. I would avoid buying it is your range / local club don't allow it, because of the steel tip inside the copper jacket. Typically the range doesn't want their steel targets beat up, and there is a concern about sparks from the steel tip. That spark concern is up to the range. M855 has typical 2-3MOA results, the design of the bullet can add to those results. If you can find some M193'ish ammo, with its 55gr bullet, that would be preferred by me.
  4. Arm or Ally is a great company. Purchase from them with confidence.
  5. https://www.righttobear.com/AO-Precision-Phosphate-Bolt-Carrier-Group-158-HP-p/aom16-hpt-mpi.htm https://www.righttobear.com/AO-Precision-Phosphate-Bolt-Carrier-Group-158-HP-p/aom16-hpt-mpi.htm
  6. Fastest at the muzzle ? ... Or the sleekest BC'd bullet / load ?
  7. Does your PA10 Gen III have an adjustable gas block ? If not... save up for one... SLR or such ( and buy on sale ) Best improvement for the buck. FWIW... I started the same way ( 308 wise ...https://www.ar15.com/forums/industry/PA10-Nitrated-18-Gen-2-observations-fixes-Criterion-barrel-results-10-Sept-17-/301-284190/ Be careful with the steel cased ammo... I don' t know the current gas port sizes on their Gen III 308 barrels. But , typical gas port sizes on 308's tend to be on the large end of the spectrum.... and that can lead to vigorous extraction, at high chamber pressures , combine that with steel cases tend not to "release" / spring back like brass cases... you might have sticky extraction or poor extraction. I suggest you thoroughly clean the chamber... and fire some brass cased ammo , inspecting the fired case for any scratches. Post pics here... and then we can tell if a little dremel polishing is desirable ( for a variety of reasons ) You can help delay the cyclic "speed" ( allowing extraction at a lower chamber pressure ) by installing a stiffer recoil spring ( 308 Tubbs flatwire ) and a heavy KAK 308 carbine buffer. ( measure yours , should be 2.5" long ) The PSA PA10 and the Primary Arms products are GTG in my book. Both are solid platforms.
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