Just got my holster for my R51 in from MultiHolsters (http://"http://multiholsters.com/shop/inside-the-waistband-holsters/inside-the-waistband-standard-holster/"). It's a comfortable little kydex IWB. Paid an additional $5 for the Coyote Brown Kydex, I like it.
(http://i285.photobucket.com/albums/ll51/arrjaysid/forum%20pics/IMG_20160910_161012_zps6mxa7jqu.jpg~original)
(http://i285.photobucket.com/albums/ll51/arrjaysid/forum%20pics/IMG_20160910_161028_zpsjda2wjyu.jpg~original)
The R51 is now a part of my carry rotation...
That's a good lookin' holster. I've been searching for one so I too can carry my R51, which was the reason to buy it. I've been carrying my PX4 Compact for years but when I saw the new Remington it was love at first sight, lol. I really prefer leather, just a little more comfortable and l like the smell ;), but if Kydex is all l can find, your choice would suit me just fine. I have been carrying my R51 in my cargo shorts pocket and feel that that is safe but not the way to go.