Cool.
I have the 556, SBR. Not factory. Pistol upper with the stocked lower. I do have issues with light primer strikes with some varities of steel cases ammo with it.
I recently got a used 556R Carbine. The 3rd gen magpuls are my tightest mags. I have not had light primers strikes or any malfunctions with it. I have used first gen and later magpuls, tapco it came with, some Chinese smooth backs, some 40 rounds smoothbacks, and some assorted European metal ribbed. It likes 124 grain TULA HPs best group wise. I no longer have any of my Norinco ammo stash.
Other than length, what is the essential difference besides length and this being real SIG vs USA compared to the 55R?
I regard my 556 as a less ergonomic AR with a folding stock.
I regard my 556R as a more ergonomic AK.
Neither of which matters as both are dead platforms.
“Where weapons may not be carried, it is well to carry weapons.”
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