Keep what I'm about to say on the level of second-hand information, but it might spark an idea among the experienced armorer's here: If my memory serves, the 14.5 mid-length configuration, having perhaps less barrel length to the muzzle after the gas port than is ideal, is more finicky with ammo, particularly underpowered, lighter bullets. FWIW.
John
"The matter is summed up for every person alive: Either submit, or live under the suzerainty of Islam, or die." — Osama bin Laden
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6.5 Grendel: The Tier One AR Cartridge.
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