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Posted On: 9/11/2020
By: Ken
A: Personally, I'd order this ammo and expect it to function correctly in a Mk IV. I've run subsonic ammo through my own Ruger Standard and it works quite well. That said, I must warn you that this ammo may fail to cycle your pistol, potentially causing a failure to extract or even a double feed. I wish I could guarantee you perfect performance, but I'd rather you be aware of the risks before ordering subsonic ammo through a Mk IV.
Posted On: 9/10/2020
By: Paul
A: I would personally order this ammo for an M&P15-22 and expect it work correctly. There is a chance your rifle may fail to cycle correctly with subsonic ammunition – not a great one, mind you, but I'd rather you be aware of that than guarantee you flawless performance!