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We did 80rds of SIG's 300Blk 125g supersonic rated at 2,200ft/sec for this 9" barrel's break-in. Her 5th and 15th round bore cleanings were as easy as I've ever seen. Just 2 or 3 patches were needed, so this is clean ammo and a smooth bore from the factory.
She ran perfectly, with no failures and locked back on every empty mag. I've zeroed at 50yds with both 556 and 300Blk while running the MRO optic. Her targets running 16" 556 are slightly tighter than the 9" 300, but not really much difference.
Here's her 9" 300Blk 10rds at 50yd targets
And this is her 16" 556 target
Cheers
She ran perfectly, with no failures and locked back on every empty mag. I've zeroed at 50yds with both 556 and 300Blk while running the MRO optic. Her targets running 16" 556 are slightly tighter than the 9" 300, but not really much difference.
Here's her 9" 300Blk 10rds at 50yd targets
And this is her 16" 556 target
Cheers
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