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John, this will be slightly large for the Remington R51. I would go with either of these custom fitted IWB Holsters : -- https://www.amazon.com/Remington-Leather-Holster-Inside-Waistband/dp/B00L1M75JU/ref=sr_1_49_sspa?dchild=1&keywords=remington+r51+holster&qid=1600648040&sr=8-49-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEzVVVMQVhaUlRSVEJIJmVuY3J5cHRlZElkPUEwNTc5MjUyMkNVMU5URE1WR0cxVCZlbmNyeXB0ZWRBZElkPUEwNTI0NzgzMjBBUVRMQjBEUE82UyZ3aWRnZXROYW1lPXNwX2F0Zl9uZXh0JmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ== ----------------------------- https://www.amazon.com/dp/B00L1M6WB2/ref=sspa_dk_detail_1?psc=1&pd_rd_i=B00L1M6WB2&pd_rd_w=zpazI&pf_rd_p=48d372c1-f7e1-4b8b-9d02-4bd86f5158c5&pd_rd_wg=Hh7Ig&pf_rd_r=VYSCPQ0Q525Q3PTAYF72&pd_rd_r=ce999ae0-9514-452f-8f09-38ddcb0fcbe6&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEzTzNMSEw0WUNVTlI1JmVuY3J5cHRlZElkPUEwOTY5MTA5MVo2MVZRTTU1WTM4WCZlbmNyeXB0ZWRBZElkPUEwNTM4NzgzMzNXNk5EUVFVTUVYSSZ3aWRnZXROYW1lPXNwX2RldGFpbCZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ

Hand gun hero is a sight where you can compare hand guns height, lenght, width etc, this holster says it fits Glock22, Glock17, Sig p220/226 I compared sizes between all these guns and the R51 and the R51 is smaller in every way by quite a bit, id say the R51 is to small for this holster as it won't give you good solid fit or any type of retention. Handgun hero comparison tool here. https://www.handgunhero.com/compare/sig-sauer-p220-full-size-vs-remington-r51 And the holster id recomend here Full Kydex, full trigger guard, to carry safely and securely. https://www.vedderholsters.com/remington-r51/