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Singuard does good work I also had a pair done.

Had to send mine in. Sent them out on a Monday and got them back on Saturday, same week.

Meh……a piss poor video of a great gun with Walmart quality crap installed. This video carries no weight with me

On page 65 of the USMC TM 10698A-10/1 it states "it is recommended that the iron sights of the combat shotgun be zeroed at a range of 100 meters with a single projectile (slug) ammunition and 25 meters using multiple projectile (00 or 000 buckshot, etc.). It is also recommended that three-round groups be fired prior to making adjustments when zeroing with slugs.”

Never worried about it or cared