BLACKHAWK A.R.C. (Appendix Reversible Carry) Inside the Pants Holster, Fits S&W M&P, Ambidextrous, Urban Gray Finish 417525UG The A.R.C. (Appendix Reversible Carry) IWB holster is designed to be as comfortable as it is versatile. With ambidextrous carry capability, two belt clips and adjustable retention detent, this holster is a must have.