Now that I’ve seen a Phrobis III mounted I’ll have to dig mine out to see how it compares to the OKC M9 I have for my shotgun. speaking of which, here’s my 500.... .....added the 9 shot 590 SP front end. Love this set up! The standard wall barrel points so nice & I love the plain Jane brass bead. May upgrade to a night sight soon but that would be the only change. Here’s my 590 Shockwave dressed up like a Nightstick..... ... waiting on the USPS to drop off a XS Big Dot & side saddle for it.