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Howdy - using the link that you posted it looks like you can't just order large or small, instead you order by the type of gun. That being, if you order the size for a Kel -Tec 380 or AMT 380 Back Up, or the Guardian 380, you will be fine.Reinz
Of the two I have, neither say on it what they are, one is very small and the R9 won't fit, it came with a Seecamp 32 I bought. Th eother one fits the R9 and I belive it is the middle size.